There are many online educational opportunities, and with your disability, you would certainly qualify for both state and federal aid. There are many jobs that you could do from home once you have an education. Look into the courses online. There are so many options to look at.
It can be very frustrating feeling like you are a burden, but, I would be willing to bet that your girlfriend only sees the love in you ~ the best in you. Try not to think of yourself as a victim. You can do more than you think you can. You just have to be proactive and look for things you can do.
I wish you nothing but the best.