I think you might have some misconceptions about the military. First and foremost, it is a job. A different type of job, for sure, but a job nonetheless.
Your job in the beginning is to do jumping jacks and sweep floors. Easy enough. But then it gets tougher. You go to something called AIT. That's Advanced Individual Training. It's there you will study and practice to do your MOS (job specialty). Not much different from college really.
Sure, you can make friends in the military, but it won't change your essential personality. Guys and girls who stick to themselves don't all of the sudden become extroverts. That is okay because we are all different. I really think you might have this misperception of the military. It's not some "brotherhood" like you see in the glossy marketing sheets. It's nothing like the movies at all.
I know college can be overwhelming and get stale. Perhaps you need a break? Perhaps your course load is too high? Regardless, life is about learning and study, whether you do it in the military, college, or on the job. There is really no escaping that.
Please see the comments for my Yahoo Best Answer. I answered a question similar to your question. I think it will give you good background and context.