Excuse me but in exchange-Spain looking plays it is very good idea to keep two-bishops advantage. Then in 8 move I did 8. ... Bh7. Pls, chech it. What ting do you kill in g6 square? I'm sure it was empty. Simple stepping in g6 square by your knight is most stupid idea - then I'm sure that you've tried to kill something, but - what?
Pls, make any other valid move