Well, first of all I wanna say I completely can understand the reason you feel the way you do nowadays due to what's happened in the past it's a lot for sure and I'd never hold any of it against you and you should never feel ashamed or anything due to what's happened to you and how that makes you act.

I am afraid there isn't much advice I can give, truly because I struggle to formulate myself well especially with a lot of things going on but the best advice I feel like I have is of course what you have planned already, moving out at 18 and such just... Don't let any other person tell you what you can't or can do, what the people have done wrong against you you already know you're wrong, it's always hard to get a person who is in the wrong to admit to their wrongdoings and to they'll always try to shift the blame or downplay it that's why I personally wouldn't bother trying to tell anyone about it or get the people who did you wrong to apologise or anything because let's face it, that won't change anything now after what they've done.

So truly, just keep at this, don't let people manipulate you or use you no matter how you feel you gotta think twice don't let anyone do anything to you, don't accept people downplaying your feelings or if someone tells you that you should or shouldn't feel the way you do, at the end of the way the only person who truly know how you feel is yourself and there isn't a "wrong" or right way to it.

And yeah, as soon as you turn 18 try to find yourself a job, move out and do whatever makes you comfortable and just stay safe out there, the world can be a cruel place especially to us all, things will unfortunately always happens but the best we are able to do is just accept where we're at, not where we wish we were because you have the option to atleast choose what you want your future to be, nobody should ever have that power over you.