How do I get my husband to shut up?

I am not exaggerating when I tell you this: My husband talks about himself all the time, from morning till night, Monday through Sunday. He talks about everything from his body, look, work, goals, things he wants, his thoughts on a million issue, and he won’t stop talking. I have told him many times, “________, you talk about yourself all the time. Please stop.” Or, “_________, I need a break! I can’t take it anymore – please stop talking about yourself so much!” I feel as if my husband has been talking about himself for the last five years (we’ve been married 4 years). It’s so frustrating. When he talks about himself, not only do I get a major headache, and not only is it annoying, but it makes me feel lonely – because when he is busy talking, he’s, well, not listening. He never ask how my day is, how I feel, etc. When I do finally get so say something about myself, he always finds a way to change the topic back to him. I am so fed up…to the point where I have thought about getting a divorce. I know this isn’t the worst treatment, I suppose; however, I’m just so tired of it and I just want to break down and cry. It’s even more embarrasing when we have guests over, or are in a social situation. He does the same thing! He’s one of those people that you just want to get away from at parties. And, yes, he knows how I feel, but he won’t change. Why does he behave this way? Is there anything I can do to help this situation for the better?