I'm glad you recognize how slippery a slope you might be on. I'm glad you posted.
I agree that a geographical cure may not be the answer. I wanted to run, to start over, many times. I hated change more than I hated my situation, though, so I stayed, and I changed 'me' instead.
I'd love to be in your position - living under someone else's roof (who I assume are paying the bills), the opportunity to go back to school (a new career - I would love that), and the youth that goes with it all.
I waited until my mid 30's to start getting well. I gave up on school, settled for a job that paid the bills, got married to a man I didn't love, and had children with him. Now I'm going to be 40, and I've got a lot of financial responsibilites to shoulder.
Start where you are. And build from there. Just don't pick up - that's one place you surely don't want to go.
Always grateful to have you here with us. Wishing you well, always.
Rowan