There is a lot of good advice here.
If you want to marry her now you’ll want to marry her in a year, or two years, or five years. So why rush to it? How do you think being married will strengthen your love or show your commitment?
As many people have pointed out, six months is not a long time. And while its great that you’re in a relationship you’re happy with and feel so strongly about, its no reason to jump the gun to marriage. Instead its better to spend time getting to know each other, experiencing life together, helping each other through rough times, etc. And all the while you can do things that show your love and commitment to each other. And that is much more important then rings and ceremonies and pieces of paper that say you’re married.
Personally, I have bared witness to many young couples divorcing, and divorcing quite early in their marriages at that. I have a handful of friends who have all went through divorces in that last year and they are quite emotionally wrecked. Like their post relationship grief is this whole other monster. The guys (my friends), married girls who were 4–5 years younger then them, they started relationships with these girls when the girls were 18–20ish. Both the girls had serious married-life crisis’ within 6 months or so of being married, and they both walked out on my friends. One married pretty quickly, within about a year and a half, and the other had a relationship for 5 years.
I’m not trying to say your relationship is doomed or something. But people change after you’re with them for a while, and people change after you marry them, and at least from my observations, young people who get married tend to freak out about being married and frequently get divorced.
But I’ll leave you on a positive note as well, because I’m quite adamant about positive thinking these days. Two of my friends met when they were 18(f) and 22(m), they dated for two years, lived together for two years, were engaged for two years, and have been married for two years. And they’re probably the most stable couple I have known, and they’re very well suited for each other. They jokingly planned their relationship out like this early on, and then committed to the time table as their relationship progressed. So, sometimes it all works out, but in this case I think its worked so well for them because they slowly built up their relationship and their life together before getting married.
I really hope the best for you and your relationship.