Don't worry, you're welcome back here, for as long as you want.
Just rare back, do your best in school, get the all education you can. Then when all things are good go, into the nearest Army Recruiter and ask him/her to sign you up.
My Army time was the best/worst time of my life; wouldn't trade a minute of it.
You'll get more out of it than you realize at the time- but you'll will be more prepared for life "stuff" as you move on.
Beware though there are wing nuts thick on the ground in the Springs area. They are alright generally, but are a bit flighty at times.