I'm in love with you two, haha (in a non-creepy way).
Whenever I tell people we're engaged and how old we are they immediately freak out. They always tell me I'm too young and I need to get out in the world, and the one I hate is "you don't know what love is at your age". I've been in college, and have met so many people, I still am madly in love. We never have major fights and in out four years haven't even talked about having a break.
Off topic but I'm in the same boat is you :) My husband and I were 19 & 20 when we got engaged - 21 we are married and purchased our first home. Everyone, including his whole family, is very very dead set against this. It made it hard, but not impossible. I feel its the way things are suppose to be :)