Why can’t I find a girlfriend?

I’m 23 years old never had sex yet or a real relationship. I asked a girl out today who constantly flirts with me and I thought was into me and so did some coworkers but she said no. I’m not a bad looking guy I hear and some have called me really cute. I have a job obviously. I don’t make a lot but not not minimum wage either. I do live with my parents still but I hear it’s pretty normal for my age group. I’m just sick of getting romantically invested into a girl and then it ends up not working out then I get depressed and stay pissed off for weeks or months. I’m literally just done with trying to get a girl. I’ve never ever had a girl that felt the same way about me like I do with her. This would be girl number 6 now I think. I think I’m just going to focus on getting laid for now.
Why can’t I find a girlfriend?
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