Am I thinking too far ahead?

Samantha
I really have this thought in my mind. It's been there for a while and all I can think about right now is getting married. I've been with my boyfriend for two years and I'm absolutely committed but I want a promise. And I want to take my relationship more seriously. I'm going to be 18 and he's turning 19 in july. Am I thinking way ahead of myself? I don't want looked at as such a child anymore. I really would just like to grow up, as crazy as it sounds that's all I'd like for my relationship. If not marriage then just a promise. When I look at my boyfriend I just feel so secure, like I have something to keep me on track. It feels like home with him, and every time I think of where I want to be in the future he's my first thought. We can still be very immature at times but we are serious about each other. He's not really the romantic type but does anyone have suggestions on what to tell him to let him understand my feelings?