Can I switch back to a high school even after this?

I'm going into GED & we haven't signed the orientation thing yet. But my gma already called the school & said that I wouldn't be coming back. I think I made a horrible decision with my future. I feel awful. I need some guidance, a lot of guidance. Idk what I want in life anymore & I'm scared. I really am. Idk what I should do, plz help me. Thanks!