I did something kinda sorta similar. I was in an emotionally abusive relationship and knew the only way to fix my life was by physically removing myself from the situation and city. I was 19 and in second year university - I knew my parents would flip if I told them I wanted to move away, drop my classes, and start completely fresh. I NEEDED out though, they didn't know half of that awful relationship.
So I didn't tell them. Or anybody. I organized the move from central BC to AB in less than 2 weeks, got a place to live through a friend of my then-current landlord. I booked the plane ticket, left my parents a note explaining my actions, and didn't tell them until I had boarded the plane. It wasn't easy and it took some guts, but it was the only way I could do it. I found a job within a couple weeks, pushed through all the scary crap that's inevitable when moving alone to a new, unfamiliar city. If you want something badly enough, you WILL make it happen. It's that simple. I've been living here for a year now, and wouldn't have done anything differently.
I can relate to feeling trapped, especially when your only option is seen as rash and risky by society's standards. It's your life and your happiness, and only you have the right to dictate that.
Kijiji is your friend. While I didn't find my current living situation on there, I've found lots of great jobs, roommates and even my current boarding place on kijiji.
Good luck, do what you have to do! Your gut is your best guide.