Justalittle, I'm the same way. I'm bipolar with various other mental issues, and I've spent the majority of my life pushing the good people away and welcoming the bad (self-sabotage due to trauma), then I do what I can to ruin the relationship.

I isolate myself completely from my family, I only talk/see them when I'm getting food. I stay up till 6am in the morning, and wake up between 3 and 5 pm. I rarely leave the house, I never see my friends, and it can be days without me talking to anyone.
I haven't always been this isolated, it's only been this bad for the past two years.

Check out this thread as well: http://forums.psychcentral.com/showthread.php?t=82234

Feel free to PM me if you wanna talk about it btw.