I guess what it says in the title. I'm a single parent, I have a salaried job (totally average pay), work 40-50 hrs a week and I can barely keep a roof over my head. This year I've had to tell my DD (7) that we can't afford a Xmas tree (one of our usual traditions). I live in London so rent is high but if I move further out for a cheaper flat then I have higher commute & childcare costs.
My exh has her 4 nights a month (every other weekend) and pays minimum child support plus half her activities. He won't take her more because "he has to work" 
He has a new partner & they're constantly off on holidays or weekends away or out doing nice things (never with DD!) My friends are all coupled and tend to live very comfortable lives.
I'm just devastated that despite how hard I work (and I'm very respected in my job), juggle all of the parenting, all of the childcare, almost the entire financial responsibility for my DD (and def all the emotional responsibility) I'm struggling so much. It's definitely gotten harder over the last 5 years and I feel like something's got to give but there's nothing left. I've spoken to StepChange and I get everything I'm entitled to (a bit of London weighting HB but no other benefits) and I just feel like such a failure and so down about my life. I guess I just don't know what to do to make things better and this time of year makes it so much worse.