I've really messed up big time?

I recently dropped out of high school because I wanted to get my ged. Im a junior and I really want to go back to school. Im just afraid they will hold me back and make me a junior again. I need about 12 credits and I don't know if i can get them. I am willing to do night school and summer school. But im afraid since I dropped out they wont let me graduate with my cl next year. What can I do any thoughts or idea's? I was planning on going to a buisness college after I got my ged but I sorta fell into depression and I miss my friends dearly. I know I should of thought it over more but I was bullied severly in high school and took the quick way out and I regret it. I also have a severe case of social anxiety and it was starting to kick in again. I just really want to get back on the right track. And does anyone know how many credits you can get per year? Thanks guys.