"Better the devil you know, than the one you don't know"
"Wherever you go....there YOU are"
In other words, who knows if things will be any better with your Aunt. You may get tired of each other, you may get tired of caring for kids and feeling isolated, you may regret not being able to go to college, you may miss your family.
Whether you stay at home or move in with your Aunt or choose another path, you will still be you, no matter where you are, your personal happiness is up to you. You decide how you're going to feel in any given situation.
On a rainy day, one person may choose to stay indoors and wallow in their own gloom while another person chooses to grab an umbrella and go for a walk and stomp in puddles. The difference between them lies in what they have chosen to believe about rainy days. One believes that rainy days are gray and unpleasant and the other is able to find something good about the rain. The experience they have is based on what they've chosen to believe and the feelings that come, are a result of their choice.
It seems like you have decided that living with your parents and family is the basis for your current unhappiness, so that's how it will be from now on until you realize that it's up to you how you feel. You are in control of your own thoughts feelings and emotions. The sooner you learn that the better off you'll be.
You say your parents have given you a car (and insurance I assume), a new phone and that they are getting nicer to you and you love them. You indicate that you have an opportunity to go to college while living at home so why not take it? Things may improve when you start taking classes and meeting a wider circle of people who will likely be more mature than the ones you already know. You'll be away from home for long stretches at school and work and you may feel like you're progressing. You may be quite surprised at how happy you are to get home and see your family at the end of a long day.
I don't want to dismiss your complaints, but to put things into perspective, there are millions around the globe who would love to be in your situation no matter how unbearable you feel they have become.
"Happiness is not like a bus stop that one simply arrives and there they are. Happiness is a day to day, moment by moment thing. Sometimes it's fleeting and sometimes it comes in long stretches and everything in between. One must be on the look out for it and enjoy it as it happens."
This is not to say that there won't be times in where changes in your life are needed but if you have control of your thoughts and emotions, you can spend your energies focusing on the needed change rather than wasting your energy obsessing on how unhappy you are and who's fault it is.
Can you tell us about your job search? What are you doing each day, to look for a job? Perhaps we can help you with that.
How about college? What are you doing each day to make that happen?