No, you did NOT mess u[p. Yes, you still can have your high school transcripts sent directly BY YOUR HIGH SCHOOL to any colleges you you want to apply to admission intoa degree program or a licensing or certification program. Colleges and schools WILL NOT accept transcripts that YOU send to them, Yes, you CAN get your own transcript sent to you.
IF your high school has webpage, you probably can make transcript request online, or you can call the front office during business hours and ask to to talk to the registrar, or you can email your high school.
You DID NOT mess up by taking a gap year.
If you went to public school that closed, get into contact with the public school distract.