wanting a baby :/

I'm 17 soon 18 and my boyfriend is 20 we have been together for a year and about 7 months. but we act like we have been married forever. I've always been motherly and I know I want kids but I want one now!! I don't know if this is a heathy feeling to have. when I see people with their baby I just think how that should be me right now but I know I'm too young and plus my boyfriend works on the road so that won't really be the best. we always have unprotected sex just because we both think that if god is willing to trust us with a baby then it will happen when its right. how can I get over the feeling of wanting a baby right this minute? help please! I'm getting sorta depressed at the fact that I don't have one yet :(