try to find a boyfriend who's not in the army
You're not going to welcome this, but find someone else.
Watch Dear John... :) Former military, from experience all men and women in the military cheat.. High % of divorce rates. Your too young to go through all the stress that you will be going through..
Connect with other military girlfriends and wives. Get their insight. Chances are you'll both move on once he's deployed but if not you'll know what to expect if things work out. He's going to leave many more times. It is a fact of military life. Get a plan or give it up.
write to him. A LOT. It will mean as much to him as it does to you. And send pictures. Mail call is SO important to soldiers.