Sex doesn

I have been sexually active for about 7 months or so now with my boyfriend. But sex just doesnt feel as good as I feel it should. Its like I can feel what is happening but its not good and I dont know if that is what it is supposed to feel like. Its hard to explain. Also we seem to only be able to do missionary as other positions hurt me. Is sex meant to be amazing or am I just not into it as much as others? I like the idea of sex and I do get horny and wet. Just the sex doesnt feel good for me and I have never cummed. It just doesnt feel good enough to be moaning or even good enough to be worth it. I have never said anything to my boyfriend because I dont want him to be upset or feel bad because he is on medication for anxiety which makes it harder for him to maintain an erwction and harder to finish up. I dont know what to do

i can masturbate and that feels great and I thought I may be asexual but have figured out that Im not.

Is this normal for when u first start out with sex?

Could it be something medically wrong? Or is it just something my boyfriend or/and I are doing?