I think i have psychological issues with sex, help? (serious answers please)?

For a while i thought i lost my sex drive completely due to taking birth control pills. But lately i have been watching porn videos in my room because it was new to me and i had never watched before. And it really turned me on! however, the problem is that when it comes to having sex with my boyfriend, it is extremely difficult for me to get turned on by him. He does NOTHING wrong, he is great in bed and i know it is just me. any time he starts putting the moves on me i start feeling anxious and my sex drive plummets, and what i start thinking is that he is only putting the moves on me cuz he wants to please himself and all he cares about sex but he reallyis a good bf and i love him a lot. I have heard that sometimes a low labido could be the cause of somethingpsychologically related and not something physical. If that is the case, could being cheated on in the past by my "first" have anything to do with it?