Not sure if I should break up with him or not?

I am currently in my first relationship and we have been going out for almost 4 months. Lately, I have felt strange about the relationship and am not very happy with it. I used to see him all the time, but now he's "busy" (we're both in college) a lot... I don't like any of his friends that I have met, and I find myself happier when I am not around him. The weird thing is, I can't exactly pinpoint what is making me feel unhappy in the relationship. I do know that he doesn't seem to think that he is lucky to have me... I feel like I am taken for granted. Is that normal? I really did use to like him, but now I'm not so sure. What should I do?