I'm just a miserable lonely person who gets too easily attached to people and resents them when they can't spend time with me
You shouldn't talk about yourself so poorly. Does this attachment lead to your relationships falling apart?
It tends to, but it is better than getting attached to them forever.
I'm sorry you're having such difficulties in your relationships, and being too attached is always a bad thing. You need to give space to others so they can breathe, it just shows you're  insecurities when you always want someone there for you. You need to work on learning to be by  yourself.
I don't give a shit! You're wrong about this.
Don't you want to stop being upset when you have to spend time alone? There are all kinds of things you can do to entertain yourself when other people aren't around. You should learn how to be comfortable when you're alone in order to stop being so demanding of your friends' time.