I met my husband when he was 15 and I was 16. I was friends with his sister in highschool and went to her house one day after track practice. She brought me upstairs to introduce me to him and he was playing with circuit boards or something (he's an engineer now). I thought "What a dork!" He liked me right away (he says) and asked me out repeatedly for a few years, to which I always said NO WAY! But we all hung out together so we were friends, I just refused to go on a date with him! When I graduated highschool he wrote me this long love letter (which I still have of course) but freshman year of college was rough and we couldn't quite get it together. (At one point he said he didn't "like" me anymore!! But when he got to school (lived in the same dorm as me) things sort of picked up and the rest is history. We dated for 6.5 years, were engaged for 1.5, and now we've been married for 2.5 years. We've known each other a LONG time!
I really think the good relationships come long when you least expect it.