I keep quitting my jobs out of fear of getting fired, and because I get discouraged. How can I stop this?

I'm currently 18, about to be 19. I've had about 5 different jobs, (yes 5) in the last 2-3 years. And each one I've quit because I've gotten scared of getting fired, I get discouraged, and to be honest, because I hate them. I've only had one job that I haven't quit and I didn't quit it because I genuinely liked it and my boss was close with my family. So I wasn't as scared, and I knew I was good at the job so I wasn't discouraged. I suffer from depression, severe anxiety and low self esteem so these emotions are dialed up to 11. I recently moved out of my parents house and with my grandmother, and I want to help her with rent, and also to get my shit together. So I got a job at this pizza place, they made pizza fresh, and it was really cool. I got to make it fresh.. but I only went in for training day. On my second day they were working me a busy shift, when I only got a fucking day of training? What? And to make matters worse, I couldn't find my work shirt when getting ready to leave. When all of this happened, I just kept getting mixtures of emotions and thoughts going on, from my discouragement to the embarrassment of not having my shirt, and it all just boiled up and I said, "FUCK IT". I just didn't care. I didn't want to deal with the embarrassment and my mental excuse was, "Well it would've been a crappy job anyway." Which, might've been true, but does that even excuse my choice?

I'm just so sick of quitting jobs out of pure fear and recklessness. My family is already aware of this, my Mom has practically disowned me because she knows I always quit jobs, and my grandmother is, well, just disappointed. But one of the reasons why I quit, is because I want to do a job I genuinely like. I fucking love computers and smartphones and technology in general. I've fixed my families computers, and TV's for years now. I want to get a job in repair. I just need serious advice guys. I know I'm young and stupid, just help me NOT be stupid.

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