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Can you help me see my mistakes

@RobKellett I don't think it was a problem because right after fianchettoing he blocked his own bishop with pawn push.
Instead of developing your pieces, you "develop" your pawns...that is unheard of at my level.
@MrCalderon I am black, I only pushed the c pawn before developing my pieces to gain some space on the queen side. Was that a bad idea? Thank you very much your response and I would be glad if you could share some additional insights.
That's fine but cxd5 is not. You need to keep the tension as long as possible in the Symmetrical Tarrasch. And g2-g3 weakens your light squares. Then you pushed your kingside pawns forwards, creating a target of attack.

If you check out my team, SoC, I made a YouTube video analyzing the QGD.
@MrCalderon I see! I just got terrified about the Qh7 move, maybe Re8 instead of g2-g3? Regarding pushing the king side pawns, it was apparently premature... Thank you very much! And in the video, that Nh7 move by opponent was sad...
i think that computer analysis is good to identify bad (relatively bad) moves, but human analysis is good to understand strategy and during game emotions. It's just a comment since i can't really identify your mistakes
@egeus I think you're interpreting #14 all wrong, which makes sense because he somehow still doesn't understand that you're playing with black. He is criticizing white's play, not yours. And regarding that move g7-g6 (not g2-g3), that was the best move in the position. There was nothing wrong with it, although you're already lost at that point: white's attack is too strong.

As to what you could have done better, I think you should have fought white's idea to break in the center with e4 more fiercely. You might have thought that provoking 12. f3 by going 11. .. Be4 was beneficial, but in fact white is very happy to get this move with tempo because it supports e4. A much better move was 11. .. Nc6: continue developing, challenge white's furthest advanced piece, close the a4-c6 diagonal (white has Qa4+ ideas).

13. .. Bxc3 is inaccurate because you are strengthening white's center even more. If you play 13. .. Ba5 instead, you could still hope to put pressure on d4 later (and you keep the option of going Bxc3 later if there is a tactic in e4).

On move 20, you have an opportunity to break white's strong center with f6. White's king is still in the center, so this could have been dangerous for white.

Finally, 23. .. Qc5+ misses your final chance to get counterplay: 23. .. Rae8 threatening Re2+ would have been stronger. Notice that the queen is not useless on a5, because it is targeting c3, which could fall if the white queen moves. The rook on a8, however, is not at all participating yet and needs to be brought to life.
In this game, I see a couple of problems that make you lose.

Personally, I see Bg4 as an inaccuracy as it allows white to kick away your bishop and, if you don't fully retreat, allow it to be traded for the knight.

On move 11. Be4 you waste your initiative by playing a move in which white can force you to retreat without gaining anything.

On move 13 Bxc3+ you trade a bishop for a knight, don't do that. Bishops are worth a little more. Also try to avoid losing your bishops to knights in general, unless there's a positional advantage to be gained.

On move 14, you defend your unattacked knight with a knight. It is already defended by the queen and a pawn, I don't see the point. Develop it to c6 instead.

In addition, improve your time management. Having only 15 seconds left on move 35 is very bad. Have at least one and a half minute.

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