How do I defend against these kind of players

These players seem to really annoy me pushing their pawns when ever I do the Sicilian. How do I defend against that?

Im okay for some live training if you wanna do it.

This is a common concept in the Sicilian. Often, Black attacks on the queenside with a6 and b5. while White attacks on the kingside. In this case, you waited too long to attack on the queenside. On move 13, you could have played d5, opening the center to punish White for not castling. If you always play the Sicilian, my advice is to be more aggressive.

@iBishop what should I do at 9. g4?

maybe 9...d5

9...d5 is a good response.
When your opponent goes for the wing attack, you should strike in the center.

Thanks for the advice guys <3

You should also had played 2..e6 to make bad the c4 bishop

Yes 8...d5, 9...d5, 11...d5, 13...d5. ...d5 is a key move in any Sicilian.
However, you did not lose in the opening, you lost in the endgame.

yes, 2...e6 is most precise. After that move black is already fighting for the initiative. He plays ..d5 when he has 0-0ed.