Hi
@zxxha
I was in a very similar situation as you. There are plenty of steps you have to go through but what I can say is that you will be able to study as a PR.
About OSAP, if I am not wrong you may not be eligible. You need to have been in Ontario for at least twelve months before applying regardless of the situation of your parents' or your own financials.
For your H&C grounds, your case is only enough: you were taken against your will as a minor out of Canada. Now that you are 18 and an adult, you have decided that at your first given opportunity, you are moving back to Canada.
If you want more details, feel free to ask me. I had a very similar situation to that of yours and now I am here studying at UofT.
Good luck.