Is it too soon?

I have been dating my current boyfriend for about six months now. However, I have known him since I was a little girl. We have been good friends for over a year now, and obviously we are in a relationship now. I have never ever felt this way before and I have been in two other relationships previous to this one. I've already told him I love him and we always talk about marriage. The only thing is that I am 19 and he is 26, but I feel so strong about him that if he were to ask me to marry him I would say yes. Am i being a ridiculous teenager? I would love to hear opinions and what not :)