having sex too often??

Aoife
My boyfriend and I are both 16 almost 17  and became sexually active a few months ago, I'm aware I'm quite young but I'm always careful and aware of consequences, but for the past couple of months all he wants to do is have sex!!! Obviously I want to too but not every time we're together which is 3-4 times a week. He tries to tease me, turn me on etc alllll the time when we sit in my room and I've told him to stop and that i don't want to constantly have sex. I've said to him how I feel but every time he just says sorry and does exactly the same thing 10 minutes later. It pisses me off every single time and before he leaves he asks if or why I'm annoyed at him and I just can't be bothered repeating myself all the time. I'm scared it'll get in the way of our feeling s until he just uses me for it. Am I being a bad girlfriend??