Can an 18 year old enroll themselves into a high school in west Virginia?

No, an 18-year-old cannot generally enroll themselves in a traditional West Virginia high school. The compulsory school attendance age in West Virginia ends at age 16. While some exceptions might exist on a case-by-case basis for extenuating circumstances (like severe illness preventing earlier graduation), an 18-year-old is considered beyond the age of compulsory education and would not be eligible for enrollment. They would need to pursue alternative options like GED preparation or adult education programs.