Should I stay with my boyfriend?? Please help me?!?

I've been in a relationship with my boyfriend for nearly two years now...we have lived together since we began dating and we have never spent more than one night away from each other. We're extremely close and we both really love each other. He is extremely loyal and trustworthy and I'm very thankful for that. The problem is that he is short tempered and wants to argue about every little thing and he is always being sarcastic and pissy towards me. No matter what I talk to him about, he always has to disagree with me and this stresses me out so much that it leads to more arguing. He is extremely opinionated, which is normally good, but he has an opinion about every little thing that I say or do and that stresses me out as well. He never wants to go anywhere or hang out with other people unless I am with him. He always makes me deal with things like our landlord, calling places for him, etc. I feel like I am more of the man in the relationship sometimes. We're both getting ready to graduate college and I am ready for marriage and a baby (I am 24)...he can barely talk about either. He says he wants that with me but not for several more years. I feel like he is never going to propose. I do love him dearly and want to be with him but at the same time I feel like we argue too much, he can be too clinging and suffocating and sometimes I think about breaking it off with him, but that thought scares me because I love him and I'm afraid that I won't find another guy as trustworthy and loyal as he is. Do you think I should stick it out with him and hope that someday he'll be ready for the same things that I want? Do you think he'll ever propose? What should I do about the constant arguing/bickering? What do you think I should do about this whole situation? Please help :\