it's not worth it
Your parents have to let you go sometime and as long as you have somewhere stable to live and some income they should accept you moving out, you are old enough now and just explain to them you don't want to be living at home forever because another chance to move out might not come around any time soon.
I say, have a long think about it, and if you want to, then go for it, because it could be the best decision you ever made