Cupcake,
My sincerest apologies for not seeing and replying to this till now. Sorry to hear how isolated you're feeling. You're absolutely right... our moods can make us VERY difficult to tolerate for long periods of time... I've lost many a friend for that very reason.
Try to maybe look into socializing in ways that fit into what you're comfortable with... for instance, I take online college courses (keeps my mind active, gives me a goal to work towards, I can do the work at my leisure and without ppl seeing me, yet I still interact online with other students and teachers). Another thing I'd looked into before I got wrapped up in classes was social support groups in my local area for ppl with social phobias. I thought it might be cool to get involved with a group who "got it" about my hangups about socializing and that I could meet with at a monthly gathering to blow the dust off my bottom and not feel pressure to look chatty. I google searched the topic (local social groups for ppl with social phobias) and actually got quite a few hits on groups that meet AND online forums. Another thing I'd considered (till classes ate all my tim...lol) was taking a ballet class or violin lessons... something to get me out of the house once a week with others who were interested in something I was.
I know you really want to socialize, but, like me, kinda need to not jump headlong into it. It's ok to take baby steps and look into things that get you interacting with others slowly... even if it starts online and ends up in situations where you're actually going out. Look for things that catch your interests and aren't overwhelming... starting small
Hugs,
Kosh