What's wrong with me?

I don't have that many friends anymore, so I only see like 2 or 3 people at the most. Besides my mom, and she'd rather not have anything to do with me, even though I'm the only other person that lives in this house. So what am I supposed to do? I've become socially awkward over the years when I used to be outgoing and popular, I can't find a job and I'm pretty much depressed and lonely all the time. People invite me to go places but I just don't feel like going...I've never been this reclusive, why am I like this? I'm only 17. I consider myself attractive and other people would agree. I have a nice personality, but I do have a very bad temper. So what's wrong with me?