Don't know what to do anymore...

Ok so, I'm in a relationship and I'm not sure what to think anymore. We've been together for about 5months. We did go out last year for about 8months but we broke up. Anyway, lately all we have been doing is arguing. Btw I'm 18 and he's 19. I've been so stressed out lately. We argue nearly all the time. He loves me, I know he does. But, I just think it's all too much for me. He wants to meet all the time and I'm not that sort of person. I hardly see my friends now. He doesn't like me doing certain things but then I'll catch him doing 1 or 2 things he told me not to do. That irritates me so much. I need space I think. I'm not quite sure what to do. Can someone please help me. I love him, I think. I know I like him a lot but I don't know if I love him. I have doubts. How do I know if I love him? What do I do?