Yes... My cause is due to Williams Syndrome, but there are quite a few other issues that can cause this.
Have you ever be out around people for an extended period of time, and found it less dreading, and more able to be a social butterfly? (it took me about some months for my "extended period of time" to kick in, and i found this to be true. With WS, I have learned even though I intially DONT want to go out and do things with people, and would much rather be "content" doing my own thing in my own world whenever i want, I wont fight against it if someone sets up the event or activities, or the "what im supose to do" for the day (as long as it doesn't bump my other activities out of the way. lol!! but instead of playing the ps3 for 14 hours, i'm content with 1-2 hrs if someone else sets up other things for me to do outside of the house). But if i dont get out, then i quickly become a hermit. And dread doing everything from what i'm comfortable with, and dont have any real motivated intrest on doing anything outside of my comfort zone (room). ..... ... and i just lost my train of thought. xD!! okay umm.... anyways, getting out and doing things is a part of living i assume, and the best way i found to be less dreading and "anti social traits" is just to do, go and do. If you can self motivate yourself, I would suggest making a trip outside atleast once a day, and let it settle into your routine, and branch out from there. and in my experience i have found that takes care of the shyness and dreading and not talktive issues I get. When I was on meds for anxiety disorders, those would help me too (but i had more bad than good with those), and then I also find the intial point of the ADHD stimulant med i'm on also causes me to go out and just talk away (Ask some of my friends xD!! they get to a point of closing the door on me and ready to throw a shoe at me or something lol!!), but there are many diffrent things that could cause it (including the enviroment in which you grew up in), and theres many difrent ways to combat it. But since going out and doing things is something very hard to evade, i've never found just staying in the way i naturally do things to help me. I have always needed outside resources, such as meds, or someone there to be like "now you need to show up to this group, it's only twice a week, do you think you can do that? The rest of the day is free for you to go back home and do whatever." <--- exactly what one of my T's told me before lol.

In this, I wasn't trying to tell you what to do or how to do it. But I was hoping to help by giving suggestions and saying what my experience has been in it. even if its just to let you know that i understand.