Ciel Phantomhive from Black Butler suffers from the exact same mental illnesses that I do, and he is around my age. When I first watched the anime, he was precisely my age, and he reeled emotion out of me that, to this day, no other character can ever muster. He personally healed me. We even have an ever so faint resemblance facially.
I have found quite a few Characters to be similar to me. One of them is Medaka Kurokami from Medaka Box. I have been posting her too often in these domande as it seems but if we're talking about THE Relatable Character, she is certainly there. Can't help it XD !!!!
The closest I can think of is Yuki from Tsurezure Children. I am not that straight in romance though and not that popular. I also have small group of 'chosen' Friends and have some other social issues. We are both very honest, friendly and Amore to tease others and joke around. We are also both scared of men and are timid when it comes to romantic actions. I also enjoy 'smart' conversations.