You need to make a plan. If you are working, start saving every dime you make. If not, possibly find work with a company that has multiple locations so that you can transfer. Decide where you want to go.
Then begin to build your credit. A store credit card is often a good place to start if you have never had credit before. Be sure to have a paperless account that you can manage online. Purchase a few items, easy to pay off each month, for a couple months. Then other creditors will start to offer you credit. Be very careful with this. Keep all of it online in password protected accounts.
Tell no one of your plans. Watch the movie Sleeping With The Enemy to boost your resolve & cheer yourself on. And don't worry about your stuff. All of it is replaceable.

I would be willing to bet your mom thinks she is protecting you because of the epilepsy. But you can manage it on your own, as you have proven with your good communication with your doctors.

Don't despair! It will get better. Make a plan. Stick to the plan. I wish you only the very best of luck in this adventure to freedom & independence.