How to get off the street:
Allow street life to so damage you that you become physically incapable of living independently.
Live in a foster care home.
(I know four people that this happened to. One got an infection that he ended up with skin transplants. Another literally broke his neck by stepping down a step. Another was hit by a car and five bones were broken. Another became so damaged by her drugs' effect on her mental health, she was placed into permanent housing, with someone watching over her.)