1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3 Nf6
7. f3
Your first mistake.

O-O 8.
Bc4

Your 2nd mistake. 7. Bc3 would have opened up your bishop and protected
your pawn in 1 move. Think about the best move, not just a good move.

Qa5 9. O-O

Now look at the diagonal g1-b7. Your king just castled into a wide open
diagonal. You're just begging to be chased! And your c4 bishop is hanging.

Ne5 10. Nb3

Instead of taking care of the problem (moving your bishop) you attack his
queen. Did you really think he was going to give up the queen? You have no
respect for your opponent. You think he will make stupid moves. You are
the only one doing that. You've already lost the game at this point.