TMI! Unsatisfying sex with bf. Help!

I lost my virginity to my boyfriend a few weeks ago. I was so disappointed, and I never feel turned on. I feel like he doesn’t want me, because he doesn’t touch me or stoke me, or kiss my nipples (he even leaves my shirt on!) and he only stays in me for a short time before being done, but he doesn’t cum! He came once when I gave him a bj, but he didn’t really even react, like moan or anything. I felt SO insecure. I asked him if it was me, and he assured me that it definitely wasn’t, that he’s Very attracted to me, and it’s his medication etc. I don’t believe he’d lie to me, but I still feel like he should act more interested in my body, or at least help me to cum, so I don’t then lay there unsatisfied... He would also have sex with me at least twice a day, but it’s so short and not enough for me. I began to feel so insecure in a week, that when he’d come on to me, I froze up with a little anxiety rather than got turned on... Please help. He’s understanding and I’m sure I could talk to him or persuade him to something.... but please help me girls.