Even as an extrovert, someone who gains from being with people (the right ones anyway, otherwise yes, draining!), I am much happier having a couple of hours alone a day. I start to feel done in without that.

Like Hamster said have you tried to push yourself? Just wondering if you can plan things that are relatively short - like lunch with a couple of friends. You know that it's just an hour or two and then you're free. Just wondering if you tried these kind of things more and more and then you'll start to relax and enjoy them and the people there and company can start to lift you.

Hugs.