20 years ago next week I was standing in line at Hoffheinze pavilion getting my HS diploma.  Seems like it was just the other day.
Enjoy it while you can.
One thing I HIGHLY recommend is, believe it or not, start a diary as soon as you can when you finish bootcamp.  It sounds corny, I know, but I wished I'd done that when I was active.  My dad told me to at the time but I thought it was a dumb idea.  I was wrong.