I'm dating a very sweet guy, who makes lots of mistakes

So I have been dating a guy who is 4 years older than I for about 2 years now. We live together and have even moved across the country together. I feel very seriously about him, as he does about me. I see myself having kids with him and everything. However I am the first woman he has been in a serious long term relationship with, and definitely the first woman he has lived with. I find myself almost constantly irritated by his behavior which can be sophomoric at times. Even little things he does can really irritate me. E.x. today he came home from the beach and instead of cleaning his feet off outside, came in then started wiping his feet off on the carpet, which I had vacuumed only a few hours before. He is almost 30 and there is a hose right outside our door... This kinda stuff just makes me fly off the handle because I feel like I am raising a child. I feel as if I have to think for him all the time. He is a really really sweet guy, very well educated and I know he adores me. Am I just being a naggy girlfriend? I think I just need to learn how to let stuff go...thoughts?

Communication is key. What you would have to do is talk to him about how you feel and what you've been thinking about, and see if he would work out a solution with you. That's the best way to solve the problem. Let him know that his childish ways are fine, as long as he doesn't do anything ridiculous like what you've stated in your example. I don't think you're a naggy girlfriend unless you nick and pick at everything he does. He just needs to stop behaving like a child and be a grown man for you, your child, and everyone else. Let him know, talk to him and all will be well :D Take care.