I think that it's entirely possible that maybe mentally you are just aren't ready fro sex. Many people mature to the topic of sex at different ages. Some start very young others bloom late. I was a later bloomer myself. It also could be just as you said. If you are having interests in woman, it could be the side of your brain that like women that is deterring your thoughts from sex with men. There is no way for any of us to know if this thought process will change for you or not, but given your age, I'm going to guess that as you get older and you meet that guy that is going to change your life and make your dreams come true, your thoughts on intercourse will likely change.