One of my worst classical games

Although I managed to flag my opponent, but to be honest, I didn't deserve to win.
Where did I go wrong? I mean, I made so many mistakes. Could they have been avoided? Pls analyse my game.
Regards

@MohammadAayanKhan in the opening I didn't understand the bh3 bg2 manure just wasted some tempi u missed 12.ng5 to pocket the bishop pair 20..bxe7 was a good find 23.nf3 was another mistake you blocked your bishop from defending the pawn U missed 25.rac1
36.bxh5 was a senseless sac
it seemed you gave many wrong checks and played a lot on intuition than calculation u seem to de-centralize your pieces a lot remember to always keep your pieces controlling the centre so that they are more flexible

@MohammadAayanKhan @Paapa987
12th
Inaccuracies
5
error
4th
gross blunders he means this in #2 in german

@Paapa987 Genius!

@MohammadAayanKhan I used google translate if you dont understand anything just use google transilate

And I thought flagging was impossible in classical.

@Mahith1708 I also have Google translate but I don't know in which language did he write.
Anyways @Paapa987 Vielen Dank für Ihre Kommentare, Sir. Aber ich denke, die Analyse wurde bereits von Stockfisch gezeigt.

@MohammadAayanKhan just use the detect language feature

@PranavBobbySekhar I also thought that, until I did that.