Questioning myself?

(X-post from /r/lgbt) I'm sorry if this seems a bit trivial to some of you, but I don't really have any Queer friends that can sort of understand what I am going though.A bit over a year ago I discovered that I liked men. I had dated a woman in the past and I thought I was straight. The only thing that I found was different than my friends is that I would never look at a women's body and think she was attractive. Straight porn would never really do anything for me. I feel like I always was attracted to a female on mostly an emotional level, the physical attraction would come later into the relationship.Anyways, I'm now in my first real relationship with a man and honestly, I wouldn't really consider dating another woman. There is something amazing about dating a man that was missing from my previous relationships and the sex is absolutely amazing. I have feelings for him on a much deeper level than previous relationships.The thing that worries me is that having feelings for a man has me feeling ashamed and confused. I really like this man I am dating but there's still part of me that questions if this is the right thing. I love holding him but I often have moments that I stop and think about what the hell is happening.The other thing is that I don't know what this makes me... I tried to live without a label but I can't for some reason. I feel the need to explain to people what I am and identify with something.People have started to assume that I am gay. I will admit that I have a lot of the "stereotypes" that are associated with gay people but every time they call me gay (never in a negative way) it hurts me in a way. I know it shouldn't, but it does for some reason.Any thoughts would be very welcome.Edit: not sure if it makes a difference but I am 20 years old.