I'm not going to text the girl I hookup with back
Why are you not going to text her back?
I need to think about my own problems. I don't have time for distractions.
It is okay to want time for yourself and to reflect but it is not okay to ignore somebody like that. You should let them know that you need time and space and then you can contact them again when you want to to continue the relationship if you want and they want.
I give up on her, I'm so fucking tired of these mistakes and dating, I'm just done.
It sounds like the issue is deeper than yourself. Are the problems from your dates with this person? What happened?