Am I gay?

Hello. First off, I just turned 18 if that makes and difference, and throwaway for obvious reasons. So ever since I was about 15 I've kind of had this thing for gay porn. Like I enjoy watching it and getting off to it, but never the relationship part of being gay. I've never walked down and the street and saw some guy and thought "Hey he's cute" or "wow I'd love to date him". The only time I do that is with girls. I might just be bi. I've obviously never had sex with a guy, but I have experimented with putting things in my ass. Such as sharpies and other things. Whenever I did, it was a mix of pleasure and well I'm not really sure what else it felt like. It was just something different. Also, it seems like anytime I get off to gay porn, I immediately down play it as if I didn't watch gay sex. I try to convince myself that I didn't. I'm not sure if this is even the right place to post, but please help me. Any replies are very much appreciated.