I used to be really shy when I was younger and antisocial because I was born with aspergers (mild autism), but I've taken speech classes my whole life and I've learned to control it, so it's faded away completely in recent years. Thankfully before starting 9th grade I switched to a private school that I spent all 4 years of high school at and graduated as a senior at last May. I think having only about 9 other kids on average per class instead of a public school classroom where there's like 30-40 other people has really helped me become super social. I am friends and still keep in contact with all my teachers, as well as there was only 50-60 students each year at the private school including grades 1-12, so it was really easy to get to know and be friends with everyone. Now I am the opposite of shy, and I can introduce myself to anyone I wish to while out and about. In fact, I'm usually the one that makes plans with my friends, they don't call me. Thanks to my aspergers I am superbly intelligent, and now I've been superbly social as well for years, meaning I am very blessed. Middle school sucked though, I got excluded every day at lunch and during the day there. I don't talk to or keep in contact anyone from that horrible time of my life. Thankfully high school was awesome, and I'm sure college will be even more awesome and give me tons of opportunities to meet people and become friends with them.
Also I can say I'm one of the few people that have taken focus pills along with antidepressants along with other pills for over a decade, and about a year ago I was able to wean myself off of them, so I don't have to rely on them anymore, and don't have to take any medicine at all now when waking up or going to bed. I was able to correct myself by practice.
I believe that people who have autism, ADHD, OCD, Dyslexia or other things can control it and make it seem like they've never had it if they practice for years. In fact many people I meet don't even know I have aspergers anymore and when I tell them they do, they say it's an inspiration that I can seem so calm, reserved, and normal now. I feel like any disability someone might have can be overcome with years of effort and practice. I even had a friend in high school who used to have full blown autism when he was younger up until he was a teenager meaning he couldn't communicate like a normal person, and one day it just hit him and he was able to control it. IMO God, the world, whatever you want to think of it as, gives us challenges and disabilities so we can overcome them and become even stronger than we were before because of it.