Why can't I seem to enjoy sex?

I'm asking this here because I need some advice anf I can't really talk about this to my mom or anyone. I'm 20 years old and I just recently lost my virginity to my boyfriend. Before that I would just masturbate (I've been doing this since I was 13ish. That's when I discovered the whole sex thing cause my mom never talked to me about sex. I accidentally saw porn and that's how all started.) When I masturbate it feels really good but I never put anything inside of me, not even tampons cause it would hurt a lot. I always had this idea in me that once I lost my virginity, sex would be this amazing thing but I'm very disappointed. I don't like receiving oral sex, it feels weird and not good like I imagined. And when we have sex, at the beginning it hurts a little and after the pain goes away I don't feel anything (no pleasure). Is there something wrong with me? Is this going to go away after a while? I feel like this is ruining my sex drive/libido.