I'm confused... I made out with my best dude friend!?

Okay so me and my best friend have been best friends for about 2 years now. We're both 17 and only up until recently I've been having the strongest attraction towards him, and I felt that he feels the same way. I've never had the most hardcore erections and ejaculations before. The other day when we were alone at my flat I couldn't help but touch his penis (no joke) and surprisingly it was really hard. Then he moved his lips closer to mine, paused, and then we started kissing. This led to making out intensely. i took off his top and he took off mine. it was sexy. Anyway he is really flabby and fat and I'm quite slim and buff (see my profile pic). and i absolutely love his roles to grab, and his massive man boobs to suck. ive only been gay until now, ive always loved f#cking girls. am i gay? bi? we both agreed not to tell anyone about our affair, im confused...... wat do i do??