I got away from some folks in my life. This helped me be more comfortable in my own skin: I'd rather spend time alone or chatting with online friends than have fake friends in meatspace.
I lived alone for a bit. I understand this isn't available to everyone - I was lucky. What that did mean was that I had to rely on myself a little more and choose a great deal more about my own schedule.
I moved to another country. Suddenly, people understand when I'm awkward. It is fantastic.
I learned to pretend. It isn't like other folks know how nervous you feel inside, and then I find out it passes. I didn't need to really go outside my comfort zone - I simply did things I wanted to do even if i felt nervous. Someone told my mother - when considering a free vacation some months after my father died - that, "You are going to be sad about it wherever you are. Might as well go off and do it somewhere beautiful" Same thing with feeling awkward: If I want to do it, I might as well. I'll feel weird either way.
I did MDMA more than once.
I travelled alone. Similar benefits to living alone, but it is smaller in scope.
Then again, a therapist might do all this faster for you. I always wonder what would have happened if i went this route.