Also shy but I realised fairly early on (early 20's) that you can't be entirely shy and function in a society with people that mostly aren't so I cultivated the ability to overcome it for nescessary tasks but honestly most of the time I'm happier in my own company with a book than out with my friends.

I hear a saying a while back and I'm murdering it but "Introverts recharge by themselves and extroverts recharge with other people" and that is me, in small stints I can be gregarious and outgoing but within a short period I just want to be on my own again, I find it tiring.