You can make it on your own.
Its very hard to imagine doing it the first time.
But, with a stable job or income, you can make it..
Just budget for bills, food and entertainment, car(gas)..
Prioritize what's important ... Bills, rent...
You have to psych yourself up and think positive about yourself.
Don't worry about your step mom or anyone else negative in your life.
Enjoy your first place and the peace that comes with it.