What should I do about my job?

I’m struggling. I work full time and I’m a single mum, I have over a 1 hour commute to work there and back every day. I keep doing things wrong at work and I’m certain that I will be heading for a warning from my boss soon.I feel like I’m sinking as I won’t get better money anywhere else if I leave. Does anyone have a similar experience/situation please, I really feel like I should just leave my workplace as I’m pissing my colleagues off aswell as my boss! I don’t do things wrong on purpose there’s just so much pressure from every angle!