Feeling like the worst mum ever

My 5 year old received her end of reception year(called kindergarten in the US) school report and I haven’t stopped crying. Having the teacher tick “working below age expectation” in some areas breaks my heart to see. I really do my best. I try to do my best to teach her. Juggling single parenting and full time work isn’t easy but I still try my hardest but seeing results like that just makes me feel like the worst mum ever. Like I’m not doing as much as I should. Sigh I just needed to speak about my feelings and since I have no friends, I’m ranting here. Pardon me 😞