"There must be something terribly wrong with me..." -Pretty Lights

So I've noticed something about myself and my interactions with girls. First off, most seem to dislike me right from the start, no matter how I act when I first meet them. Awhile back, I exausted all the options that I had in my classes and whatnot, you know, the people you see every day. Not one of them seemed intrested. I knew I needed to meet new girls, so I started striking up random conversations on facebook. This got me a few numbers of girls my age, but something odd happened. I talked to 3 groups of girls, younger, sameish age, and older. The younger ones were almost never intrested. The ones my age ended up becoming decent friends at the MOST. But shockingly, older girls seemed to respond extreemly well to me. When I waas 16, I had a 20 year old ask me out, although neither of us knew about the age diffrence at that point. Obviously it was called off once that was brought to light, butto this day we are still good friends and we talk a lot. Older girls always seem to like me, and personally I like them more. They are far more mature than girls my age (I don't know if hipforums has a minimum age, I got kicked off of 420chan when I was 16 for accidentially saying my age, so I'm not going to post it here. I'm still in highschool tho, but for all you know I'm 18 so leave me alone lol). I don't know what it is, am I just too mature and intellegent for girls my age? I'll admit that sounds concited, but I don't know what else it could be. I mean, I'm open about my drug use, and that can be off-putting I suppose, but older girls are into that too! Either that or they don't care, but most of them at least drink. Anyway, I would be fine with ALL of this if they didn't get scared off because I am younger all the time. I know girls want an older guy (usually) and especially at this age. They want power and dominance and all that shit (to a point). I'm pretty big I guess, 6'1", and 225lbs, so physically I'm what they want. They just trip over the age thing I think. I don't know, does anyone have any advice or encouragment for me? I'm not looking for a fuck-buddy, I want a girl that loves me as much as I would love her. Any help at all?