I got a question?

Okay so I'm 16 and I have my boyfriend which he's 18 we haven't been going out for that long but I don't really feel comfortable with him like I mean I do but at the same time he's not my cup of tea and I want to tell him but I don't cuz he says he "loves me " but my ex would say the same and What I dont like is that he always wants to have sex ...What should I do 😒