One of my daughters ultimately did the work to get her GED (Graduation Equivalency Diploma) after being unable to complete High School, and maybe something like that could be an option for you. Another possibility is to just do what you reasonably can right there where you are (even if you fail some courses) and then later see about alternatives for taking care of the deficiencies. Whatever you might decide, however, just please do try to keep in mind that giving up too early is almost never a good idea.