First off, I think that my situation, in a way, is similar to yours. My boyfriend and I have been in a serious, committed relationship for almost 3 years. We're 26 and 27, respectively. You have only been with this guy for 7 months. Have you ever heard the saying, "Enjoy that first 6 months while it lasts because it will change after that."? This is true to an extent. As you grow more into your relationship, you become more comfortable around each other and tendencies that you would normally only have around your immediate family or close friends start to show (think: leaving your clothes on the floor, passing gas, etc.). I can't understand why you're in such a hurry to rush into marriage, you should want to take some time and make sure that he's actually what you're looking for. Do you even live together yet? That can change a lot of things in a relationship. My boyfriend and I had a difficult start adjusting at first (we moved in together about a year ago, I'm a neat freak - he's definitely not), but through it all, we've realized that we want to be in this relationship together.
Your boyfriend must like you a lot...I haven't met very many guys who tell girls that they see them as a future life unless they're very serious about them (or big-time players looking to score - which doesn't appear to be the case here)...but that doesn't mean that he's ready to get married right away. Everyone matures at a different rate...I had friends who got married a year out of high school, others who were having children during and right out of high school. I always wanted to get on my feet first, get a career started, mature some before I took the leap. Be happy that he doesn't want to rush right into marriage, most people that I know who've rushed into marriage have ended up in an unhappy relationship or in divorce court. My boyfriend and I have discussed marriage on and off for some time now, but we realize that it's not the right time for either of us right now...that doesn't change our love for one another. Marriage is only a piece of paper and a ring..if you don't have the basis for a good relationship, it won't help to make it better. That said, if you do have a good relationship, give it some time and you may be pleasantly surprised.