Facing homelessness, what are my options?

I am a 22 year-old male from the UK. I've an associates degree, a coaching qualification and a multitude of computing certifications (from Microsoft and Comptia). However, I am falling down a bottomless pit... I've �10,000 debt to pay for university, �600 ordinary debt, and the government is making me pay �3,000 now because I tried to continue with an education even though I am sick. My family aren't doing anything to ease matters, and in fact, are making everything harder for me to deal with. For someone who is sensitive and easily depressed and anxious, this is an awful combination. And that's it, I've had enough. I can't keep living like this. I want out of here. I crave change. I can't have my family always criticising my every step. I would rather live on the street than continue with this life. I want to just move out and live however I can... sleep in my car, apply for every job under the sun, work until I'm dead and then some more, until finally I get some release and finally can afford my own place and start a new chapter. I am so very sick...