I've wanted that too. A big part of why I'm ctb is because my relationship with my family is and has been so bad.
With regards to UK mental health services, I've reached out for help many times and gotten nowhere. Prozac/fluoxetine used to work well for me, but hasn't for years now. I'm not under any kind of mental health provision/support now, though I tried many times, I've now given up on them. I even grew a pair and told them this and I was taken off a waiting list for therapy which I'd been on for a year lol. I actually feel as though the NHS would rather that I kill myself. I think that I either have AvPD or some form of autism - I can't develop relationships with others though I would like to, I have severe trust and avoidance issues. I'm completely alone, though I don't want to be. I find it quite hilarious how I live my life, and yet, as far as I'm aware, I have no diagnosis beyond depression.