Do you ever watch Seinfield (the show). It just sounds like you have a man crush. That doesn't mean you are gay or bi or anything. Females often go threw the same thing. They do everything together, go to the bathroom together and often explore lesbian type things together but that doesn't make them lesbian or bi.

You are young, you have unexplored likes. Weather to explore those is up to you. If you re content with your GF then I wouldn't worry about it to much.

It is ok for a male to find another male attractive. I mean we are the greatest for of art. So it is ok and doesn't mean you are gay or bi. I can admit to my H that a girl is pretty, or attractive or what ever. No big deal.