Losing friends?

I...dunno how I should feel anymore. Lately, it seems that less and less people want to talk to me. Why? I have no clue. I'll IM someone, and either get no reply, or "I'm too tired to talk", or some other reply about not wanting to talk. What I would really like to know is have I done something to upset ALL of my friends. I think there are only 2 friends anymore that care to talk to me. Sharlet and Tammy. Why does no-one else wanna talk to me. Well, actually, Holly also talks to me when she's at the computer, but lately she's been having some troubles, so I won't include her in this. All of this has just been making me feel really...REALLY lonely. Life really sucks. All the friends I had in school moved away (although, that's part of getting older), and now almost all of my Internet friends are drifting away from me...making me feel lonelier and lonelier as time goes by. It's majorly depressing.