can’t win any game - even after lessons

I've gone over some of your games. You, as many others here, are victim of overly aggressive moves by other beginners that you can't refute. Perhaps others will give you the usual tips for beginners (do tactics, respect opening principles, do not leave pieces unprotected, castle early, etc). I'll give you 2 tips based on the games you typically find yourself in: 1) If you have a chance to swap off your opponents knights, or restrict where they can move, do it. Knights are very annoying. 2) Against annoying queen excursions to a5 and similar spots, play nf6 early in the game (ideally after you played a pawn to the center). When the queen comes out, be aware of f7, where your pawn is also defended by the king before you castle. That's why you want to interpose a piece between any attacker and that f7 square. As a side note, there is one opening move which greatly discourages queen excursions on your kingside as black, which is 1.e6 as a reply to white's 1.e4. Notice e6 as a first move protects the f7 square.

looking at a few of your games, it just seems like your moves don't always work together. in your most recent game, for example, you move f7-f5 in response to e2-e4. white's pawn wasn't really posing a big threat, but you responded by making yourself very vulnerable.

Thats what happens when you play speed chess.

Za pocetak, zamisli da je f pesak zakucan za tablu i da ne smes da ga pomeras. Otvaraj se sto brze, ne pomeraj pesake sem d i e, eventualno c pesaka. Cilj je figure izvuci ka sredini u otvaranju, pre svega lake figure - konje i lovce. Rokada sto pre, obavezno da bi kralj bio zasticeniji.
Ako te ne mrzi da citas, ovde imas opste savete kako da se poboljsas:
https://www.chess.com/blog/nklristic/the-beginners-tale-first-steps-to-chess-improvement
Ovde imas dosta detaljno kako da igras u otvaranju kao pocetnik:
https://www.chess.com/blog/nklristic/surviving-the-opening-first-steps-to-chess-improvement
Imam ih jos par, ako ti se oni budu svideli, i naravno pitaj ono sto nije jasno.

Just make it a goal to get your king castled every game, man. I wouldn't actually worry about lessons at this point if they're giving you ideas that are leading you astray. Don't be remotely creative early on. Develop and castle. Don't overthink things.
There are a number of things where you can improve. One thing is calculating when a piece is defended and when you need more protection. If your piece has as many defenders as there are attackers, you are fine (though e.g. queen and king defending against knight and bishop loses, the defenders should be equally valuable pieces).
A second thing is that you should always check that when you are in check, can the checking piece be captured. You missed a lot of those and just moved the king.
One tactic that you often missed are discovered attacks, i.e. a piece moves in front of another piece, which can then attack one of your pieces. If also the moving piece attacks something, you are in trouble. You should try to prevent discovered attacks by moving the piece that would be attacked (or protecting it).

that's called "tilting" take a break come bac, as I can see from your profile you won a few games. Make sure you develop your pieces castle and contol the center in the opening, make your pieces as active as possible in the mmidldgame, activate your king in the endgame, create passed pawns push them, Also practice tactics
In the game you mentioned, your opponent played 4. Qh5+ (a pointless check) and you responded with Ke7(??). Weird blunders like this are what you should be thinking about. Until you stop doing this, nothing else matters.
https://www.chess.com/analysis/game/live/5880606453?tab=analysis
Post some of your games and insert your thoughts on your moves. From a quick glance I see games where you move your king around for no reason, whether because of an easily blockable check. There are also times where you just give away pieces or don't take free pieces.

You should thank your lucky stars you are 1200. Many people are lower than 1200.
You should thank your lucky stars you are 1200. Many people are lower than 1200.
They aren't. That's the daily rating, which they have no games in, so it seems to be listing some kind of default.

You should thank your lucky stars you are 1200. Many people are lower than 1200.
They aren't. That's the daily rating, which they have no games in, so it seems to be listing some kind of default.
Enjoy it while it lasts

From one begginer to another,, one thing that really helps me is to play the high rated bots (for begginers, consider high rated like 1200-1500) before playing ranked matches.
It helps to "get in the zone", and eventually u will fall for so many traps of the bots that ur game will also improve with this.
From one begginer to another,, one thing that really helps me is to play the high rated bots (for begginers, consider high rated like 1200-1500) before playing ranked matches.
It helps to "get in the zone", and eventually u will fall for so many traps of the bots that ur game will also improve with this.
From what I've seen, better to play ranked matches instead of the bots. Bots play differently and players frequently seem confused when they do ok vs bots but so badly vs players. Generally you are trying to learn how to play chess to play other humans, not bad computers. Also, human games are saved, bot games are not.
Better to play people, then take some of your saved games and post your train of thought with your moves.

From one begginer to another,, one thing that really helps me is to play the high rated bots (for begginers, consider high rated like 1200-1500) before playing ranked matches.
It helps to "get in the zone", and eventually u will fall for so many traps of the bots that ur game will also improve with this.
From what I've seen, better to play ranked matches instead of the bots. Bots play differently and players frequently seem confused when they do ok vs bots but so badly vs players. Generally you are trying to learn how to play chess to play other humans, not bad computers. Also, human games are saved, bot games are not.
Better to play people, then take some of your saved games and post your train of thought with your moves.
I didn't said that it's better to play bots.
Just that by playing bots u get to fall for simple opening traps. Also, I think that "getting in the zone" is something begginers underestimate, like to be really focused, and I like to play bots before humans just to have a "transition" game between my work-daily problems mentality to chess-focused mentality, not risking rank points.
Also, as a begginer, I feel better to take risks and try something out against bots.
But in overall I agree with you. Midgame and endgame with bots feel really weird. It's just that for me, chess student for 2 months, bots are still helping me.