Take a few breaths and calm down... He is probably bisexual in no way does this does not mean he is not attracted to you. Teen usually means 18-19 that is not necessarily a big deal (assuming he isn't watching anyone actually underaged).

If it bothers you THIS much you might as well break up with him but imo this is 100% overreacting. Also porn use does not always translate to what you want in real life, at least in my experience.

This is exactly why most men are uncomfortable talking about porn use with their girlfriends. Sorry if this sounds harsh it's just pretty common for people to have seemingly strange tastes when it comes to porn and does not actually mean he is not attracted to you or gay.