Welcome. I'm new myself. I totally understand the frustration. My whole youth was abnormal, so it always felt like I wasn't destined to have a normal life. And you know what, there can be a purpose to it. But it does get lonely. I look at people conversing like nothing and it makes me sad. I've no friends. x(
It sucks you weren't diagnosed earlier, true and I am sure most schools aren't too attentive to the needs of our type. Though, myself I do remember being put in to SPECIAL classes, because they knew I was different, just not sure what... and it alienated me from everyone else, like I wasn't before!
Geesh, I think our purpose is to show the world about it so younger people than us won't have to struggle through life not knowing anything... and we can find people similar to us to be friends with. Because where we lack in social skills, we are very intelligent. So don't worry, you'll find your niche.