You are not stuck, it just feels this way because the way to get somewhere permanently is by baby-steps.

I am going to give you quite a simple exercise which has worked very well for me:
Pick either the person you trust and care about the most (who still trusts and cares about you, so not your ex boyfriend)! Or if this is too hard, a memory of doing something you really felt at home with. Whenever you feel as you really hate your life and are in an enviroment which makes you feel uncomfortable, think about this person or moment and feel that it existed/the person existed.

For me, it always helped me to know that there's possibilty of goodness out there. It might be worth a try. Best of luck.