It went downhill from there. I became the target of a lot of bullying and harassment from the alpha jackass, leader of the coked up jackasses that worked there, and eventually he gave me a degrading nickname that implied that everything I touched broke.
I was constantly stressed out, felt like the worst employee in the world (at that age I didn't know I was the victim at this point) and this self-fulfilling prophecy just made things worse. Suddenly I'd become bad at my job. I couldn't fix 5 computers a day, and they often came back with problems.
Was this issue me? No. the issue was a highly toxic workplace where I was berated for my successes ("Oh look, he fixed one, must be a F****n miracle") and expected to fail.
I'd have quit, but I needed the work. The manager, a lowlife cokehead and strip club aficionado, mercy fired me 2 months in. He saw the problem but didn't care to fix it. Of course, I was better off. They were a crooked shop to begin with and my reputation was at risk for having worked there even 2 months.
Many years later I am a well respected manager who never treats employees like this. I am well aware that if my employee is failing me, then in some way I am failing them. I work on the relationship with the employee as much as I work on the issue. I encourage their successes, help them work through any issues, and show confidence in them until they start showing confidence in themselves.
I can honestly say this approach has worked wonders, and I've seen huge HUGE turnarounds in employees who thought they could never make it. Now they're rock stars.