I am scared.

Briefly: I've been playing chess for about 1 week, I learned some bases (very little) and I started to suffer because I reached 700 rating and started losing out of nowhere, should I stop playing and study more about chess or do I continue and learn by losing?

I lost 4 rapid games, but like, 2 in a row since I'm in 700's.

About HyperBullet, I lost 11 in 36, but I think It's ok since It's very fast paced a and I actually feel like learning from it.

it is difficult to learn from rapid games.  Anything faster than half an hour per side is probably so fast that you are just losing or winning due to dumb mistakes at this level, probably just hanging pieces by trying to move too fast or simple combinations that you would have seen if you had taken a moment to look closer. 

So, you may not like it, but the best idea I can give you is to play a few slower games and then study why you lost them (it may be, again, just hanging a piece.  Learning to not lose pieces due to carelessness is the first major milestone, really).  

Thank you. I'll try to play some slower games.

Improving Your Chess - Resources for Beginners and Beyond...

https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond

It might not be the most appropriate if he started out chess only a week ago.

For him, familiarity with the board and gameplay will be of priority. In other words, it's probably a good idea for him to move around the pieces to have a feel of how pieces cover different squares. Let him have fun with the board first.

I'm sure young kids going to school for the first time do not suddenly sit for exams on the first few weeks - they come to a classroom and learn the ropes in a fun and interactive manner.

Give yourself some time.

Once ready, you can start studying the most basic of checkmate patterns (which is required for less experienced players because many games at this level are played out till the very end).

"You may learn much more from a game you lose than from a game you win. You will have to lose hundreds of games before becoming a good player."
— José Raúl Capablanca

Go ahead.

sure, play what you enjoy and get a feel for it.  But I did look..

his last 10 games when I looked were 7/1/2 and of the 2 he lost, one was a basic queen drop (he took with a pawn exposing the queen to capture) which I think, given his display so far, he probably would have seen with a min to look at the position, and easily missed with < 30 sec on the clock. 

Don't be scared.  But don't be so foolish either.

Hm, ok.

Thank you. I appreciate it.

There is a 99.97% chance you will be fine if you catch the coof, not so much in chess.

If you face someone your own rating you are suppose to loose 50% of games. Well not exact because there will be some draws to. But rougly around 50%. So you just gotta get used to loosing. So if you play 10 000 games you will loose around half of the game, 5000 lost games  

One can boost winrate simply by playing people that are less skill then you. Like for example if a 1500 play vs a 800 he will get a very nice winrate. 

That's actually a good point.

Fact.

In the beginning. I hear many people to not worry about rating as much.

Wow.

Does Capablanca mean...

...that a player who loses hundreds of games, without a single win or draw in his games, will become a good player?

Jimemy meant win percentage rate, not rating points.

Of course a 1500 is expected to win at least 80% of the time. But in terms of rating points, that one loss by a 1500 would be very costly for his rating.