What do you want to do in the military, be enlisted or be an officer? If it's the latter, you're going to need a degree. You can enlist and work your way up into the Officers' Corps, but you still have to have a 4-year degree before you can pin on O3. Moreover, with the way the cutbacks are going, I wouldn't be surprised if the OCS numbers drop dramatically. Precipitously, even. So if you want to be an officer, ever, the course of action with the highest probability of success is to do it through the ROTC program. Which means you'd have to go to college.
You could also enlist for a short stint with the intent of going to college immediately after. You can even commission this way; I know of several officers who were enlisted, got out entirely, then went to school and were commissioned either through ROTC or West Point. If school funding is a concern, the post-9/11 GI Bill is extremely generous (although I wouldn't be surprised if that got the axe soon, too) and the only way to get that is to enlist first.
You can also join the Guard while you're in college; back when I was in school they called it SMP- Simultaneous Membership Program. So you're a fulltime college student and part-time enlisted member of the Guard. I thought of it as a great way to get some practical enlisted experience before joining the ranks of the Officers' Corps after completing ROTC. I couldn't do the program because of a specific constraint of my scholarship, but I though it was a good idea and would have done it if I could have.
There are also military junior colleges like Georgia Military College (not to be confused with North Georgia College, which is also a military school but is 4-year) where you can get commissioned in two years. You can also do SMP while at these schools (or at least you could back when I was in ROTC).
Finally, whatever you decide to do you should keep your options open. You're a junior, right? What kind of scholarships are you applying for? What schools are you considering? What are you doing to keep your physical fitness level up? Even if you're dead-set on enlisting after graduation, it's not going to cost you much to apply for a bunch of scholarships/programs/schools, IMO you'd make a better decision once all of the viable options are truly on the table.