Help needed with Boyfriend?

We have been together for over a year and a half and I think we love each other but we really are like chalk and cheese. The Problem I suppose has always been there I was my Boyfriends first Proper Girlfriend even though im a lot younger and over the last year he seems to just be obsessed with that’s all he wants and I feel like that’s all he is with me for and its heartbreaking. I understand his drive is allot higher then mine but im made to feel bad if I don’t give it all the time and recently I said no to performing a act on him because I hate it and I don’t feel good about it and he turns round and tells me its over and said if I really loved him I would do it for him, But all I can think is if he really loved me and respected me he would not make me do something I don’t like and that makes me feel bad, Please help I dont know what to do I really love this person and im so Confused.