What is wrong with me? Am I mentally ill?!

Best Answer - Chosen by Voters

you sound like you're depressed, some would call it a mental illness, but if anything, I'd say it's only a temporary mental illness if you seek the help you need. Try getting a therapist, or talking to your school counselor. I know how being abandoned can affect ones mind, but try to start thinking more positive. When you get angry, try to find beauty in something around you.
I hope you get well, and that your lifes journeys will bring you joy!

It sounds like it could be borderline personality disorder.

Yes, it does sound like you could be mentally ill. You should go and see a doctor about this.