If you go to college you can always apply after. Ask those guys on active duty how long it has taken to get their degree? It takes a long time. My adivce is go to college and give yourself more options.
Took me 11 1/2 years, I didn't start taking courses until about the 6 year mark, after my initial training and seatour. Then I had an AA in about two years, and then selected for STA-21 at the 8 1/2 year mark. Once selected I was a regular college student.