Is it normal that i barely want to have sex?

So I am 19 and am in a 2 year relationship. My bf is 18 turning 19. We have sex about twice a week. And I know he wants more of it because he will complain about me going to sleep, and if I try to sleep he will get on my nerves so I cant sleep. I told him I didn't appreciate him bothering me while I was falling asleep and lately he hasn't been bothering me but just looks at porn before going to bed. I know this because I see his dirty boxers with cum on it the next day. He used to deny looking at porn and I told him though it did bother me that he was jerking off to other girls vagina, I won't be mad if he just tells me the truth. I told him I knew it was normal for guys to look at that.

But anyway, so sometimes he will complain and be all like "whatever" when I say I don't feel like doing anything. So sometimes I give in and give it to him.There will be days that I say to myself "ok, we're gonna have sex today"
and i'll get all cleaned up and shaven and wear something sexy. He then is like "so what? we only have sex when you're in the mood?" and I explain I did it for him but then hes like "I don't want to do it just because you feel obligated to" but in the end we do it, and yes I have an orgasm.

But after sex I dont feel like cuddling. I just wanna kock out and its a new day in the mornin. But after sex he goes on the comp. all night and doesnt wake up till like 2 in the afternoon, while I have been awake since like 10am.

Is there something wrong with our relationship? I feel like we are living seperate lives. Sometimes I feel like there is something wrong with me.

I forgot to mention that I only enjoy sex in ONE position, the other ones either don't feel good or hurt. And im not very into trying to make things kinky. The most I do is shave and wear something sexy. (He loooves when i'm shaved) Sometimes I am afraid to get naked in front of him because I dont want him to get all horny and then dissapointed. "/