I am 17 turnng 18 In December, my boyfriend is 19 turning 20 in June
I am planning on moving out when I'm 18 Is there anything my parents can do legaly to make me have to stay

Once someone turns 18 in Ontario Canada they can move out, as far as I know there is no law to keep you there. If you move out your parents might not want to talk to you anymore. Just think about it it's not as easy to live on your own as it would be if you was at home with your parents.