I highly recommend drawing in public as a hobby.

I'm as introverted as the next guy, but I had a great experience doing this - I find that people take interest in your work, they might start conversations, offer suggestions of where to go draw next, etc., BUT there's also no pressure whatsoever on you to respond to them if you don't want to, since you're actively concentrated on another activity.

It's a great hobby that allows you to feel more connected to others even if you aren't happy with your work or don't consider yourself an artist. Highly recommend!