Do not go the military route if it is just to get free flight training (I absolutely hate it when people give that advice on this board). Join the military if you truly want to serve your country, because you will be making a significant commitment. Those that joined pre 9/11 thought they would never have to go to war. Well, we all saw how quickly that changed.
You are on the right track by working at a FBO this summer. That will give you valuable ground experience even if you don't fly that will help later on. It will also start your networking opportunities early on which is huge in this business.