Why can't many of us hold jobs?

Im pretty discouraged right now...my manager is starting to find little things that I do wrong instead of all the good stuff that I do. I try to keep a smile on my face at all times but I know deep down that it's probably because I trigger my manager...at least that's the way I feel in my interactions is that no matter what i say, 75 percent of the time i end up triggering someone

Sighs..this is just so frustrating