I think I'm kind of like the leftover piece of pizza that nobody wants, because I'm everyone's last resort when it comes to hanging out
That must be frustrating. Why do you think that way?
I believe people usually try to hang out with other people, but if they can't, they come to me.
If you are being used and being mistreated, you should find new friends. Being the last resort is no way to live.
I'm not always in a position to be choosy. I feel like there are few friends around here, so I'll take what I can get.
It might be great to try going somewhere completely new to meet people. Don't limit yourself to people you already know. Wouldn't it be great to meet a totally new set of people who would value your friendship?