What to do, almost 30 and boyfriend immature?

My boyfriend is 30 and I'm 29. We dated in high school and he rejected me. His first girlfriend (before me, over 10 yrs ago) cheated on him, and he was jealous in the beginning of our (more recent) relationship. Now I'm the one who's more jealous. I left my last boyfriend because he looked at obsessively. This guy does it too, even though he said he wouldn't. Now I wonder if he wants something else. On top of that he yells a lot, is very testy with me, and fights with me all the time. He always seems to have a scowl on his face. He wakes me up abruptly by shouting to me from the other room when I'm taking a nap - a peeve of mine (never seems to learn from his mistakes, always forgets to flush the toilet, etc). Sometimes I feel like I can never get any relaxation with this guy around, he is always looking over my shoulder or telling me what to do. Previous relationship was pretty easy going for 4 years before I discovered the addiction. Am I too young to move on and find someone new? They say you're supposed to have kids before 35 (and some say before 30). This guy is kind of immature - he says rude things that a gentleman would know not to say (such as "your look big in that picture" or "arby's beef and cheddar? that's f**king nasty, it looks like a beat up " - he's a vegetarian and always tries to gross me out about eating meat)