3. Be3 is not a good move at all, the bishop is misplaced there and blocks the e pawn. Better are 3. c4 or 3. Bf4.
And you can't use the same moves over and over against anything. You have to use the possibilities the opponent gives you (that's also true of the middlegame and endgame).
I would replace Nf3 with Nc3 because then the knight attacks the pawn. If black played Bf5, I would do Nh4 to attack the bishop. Also, c3 (which i am assuming threatens the Nc6 knight from capturing) is pretty much meaningless, as you could instead have the Be3 bishop OR the Nf3 knight attack Black's knight.
Here's an opening that I learned and might help you:
danish gambit as white, caro-kann as black 
my most common opening is petrov's defense three knights
Vienna system 1.e4 e5 2. Nc3 (or Vienna gambit if enemy plays 2. ... Nf6) as white, And Caro-Kann as black.
VIENNA
The Vienna is quite versatile and offers some very threatening gambits:
The Vienna gambit:
The point here is that in this quite common position, definitely on lower elo, you play 3. f4. If your enemy takes and you advance your e pawn, the knight only can move back to Ng8. There are some ways to defend the knight with a queen but the position is already losing for black. Also, many people often play Nh5 or Ng4, forgetting that the Queen can see the Knight.
2) The Vienna system alone also offers one very powerful gambit - the very powerful Meitner-Mieses gambit, which you can play from the copycat variation (when black copies your moves):
In this position, white will often defend the f pawn and rook with Qf6, and that's when you play the crushing move Nd5:
The point here is that black has to deal with a very difficult task of guarding both of the rooks, and the queen - there is no way to defend all of them. Black can try and mate you on Qc8 but it just won't work and Nh3 will end up trapping the queen in many instances (but it is the most challenging response to deal with if you're not used to such aggression).
I cant count how many times just the above two variations of the Vienna brought me a win.
Caro-Kann
Caro-Kann has about 3-4 lines you will see quite often (advance, fantasy, exchange and 3. Nc3). Most of them carry similar principles (check out the opening on youtube or the opening explorer here). It's slightly passive and the position can get cramped for black quickly, but the pawn structure is really strong on black side.
Moreover, this opening can (apparently) get you to whatever ELO range, and oftentimes your opponents will not know how to respond to it.
Note: someone with more knowledge might add something to this, but I found high success with both the Vienna and Caro-Kann here and on another unnamed site as well .
I actually began with these openings as well. The Vienna as white and the Caro-Kann as black. Later added the Benoni against d4, mostly the Czech variation as it's pretty simple. I still play the Caro-Kann but I would say the most common variations would be the main line ( I actually play the Karpov here ), the advance, the exchange and the Panov. I can't remember the last time someone played the Fantasy variation, maybe once in 200 games.
Oh sure the Czech Benoni, there's the Czech defense that arises usually from the Pirc after 1. e4 d6 2. d4 Nf6 3. Nc3 c6, the main line for the Slav with Bf5 is called the Czech variation.
So I'm slightly getting better at chess, and I'm wondering about what is the best possible (or a decent one) position/opening/book I could use? One opening for white, diffrent one for black. And since I don't know much about openings, I (at a low level of strats) just strategicly mix in a few pawns, some knights, and a bishop. It's a fine "opening", if you can even call it one. But I can't just use it forever. Here's an example of what I do. (I'm white)
Got any ideas or tips? Or mabye a way to make my opening slightly better? Please let me know!
At your level, you might like a "system" kind of opening, where White plays for the same kind of setup almost every game, and simply adjusts based on what Black is doing.
Here's a Grandmaster (Hikaru Nakamura, #20 in the world) teaching a beginner how to play the London System. He does a nice job of covering all the basic ideas, in about an hour of instruction. You might find it helpful.
(The instruction begins at around the 3:10 mark.)
So I'm slightly getting better at chess, and I'm wondering about what is the best possible (or a decent one) position/opening/book I could use? One opening for white, diffrent one for black. And since I don't know much about openings, I (at a low level of strats) just strategicly mix in a few pawns, some knights, and a bishop. It's a fine "opening", if you can even call it one. But I can't just use it forever. Here's an example of what I do. (I'm white)
Got any ideas or tips? Or mabye a way to make my opening slightly better? Please let me know!