I feel like my boyfriend only wants me for my nody am i overeacting?

So were both 15 and this is really complicated because I know Im probably being srupid about this but I just cant help how I feel.

I just feel like every time we see eachother we have sex and I feel like a hypocrite because when he asks me if I want to the answers usually yes but I think the difference is that I dont go to his house expecting sex, I dont see him JUST to have sex, I feel like he does ask me to come round to have sex.

And I know its not the only reason he sees me but i feel like its a main reason. Cause when im on my period and we cant he gets really like mardy and whiny

I dont know what to think of it all is he just a normal 15 year old boy? Hes my first boyfriend so idk how this works.

I think a few things that would give you context is that hes my first ever boyfriend and I lost my virginity to him 13 days into dating him which I feel like I rushed but thats totally on me he said countless times "we dont have to. If youre scared or nervous we dont have to" like thats completley on me

Another thing is that he lost his virginity when he was 13. Idk if that would change anything but maybe hes just used to it and im not. Cause Ive experienced SA from the age of 7 so I have a weird relashionship with sex

Idk it just seems like he only invites me round so we can have sex and Im ok with doing it but its just like- is this the only reason youre with me? Cause ill put out for you? Idk maybe Im just insecure.