what would you do in this position? and why?

Hello guys, so this is my first time posting, so I don't know if I'm doing this right, ( also exuse my spelling)well I'm a newbie, and this is a game I played with my teacher, that ended with a draw, tho Imho he had this game, I started with a ruy Lopez opening, (I'm white) started of strong and offensive but made a silly mistake and the game got changed around, now I'm playing defense, my knight is pinned since Queen to q2 would be mate after I move my knight, I was thinking of playing f3 with my pawn, but I'm not sure, what do you guys think?

Edgar, I think Nf4 is a fine move here. It attacks the bQ and covers the g2 square, eliminating the mating threat. What do you think?

After Nf4 how do you deal with Nf3+?

(nevermind - after Qxf3 Bxf3 Nxg2)

Wow Liburkin never thought about that, definitely should of done that

Fiveofwords, yeah the game is already over, I  was just wondering if their was anything that could change the game around