Like trying on jeans, don't be afraid to jump into a group that looks like it will fit you. Don't be afraid to put them back on the rack, either, if you pop the button when you try to breathe. You have control of your life and must shape it so that it fits your needs. Your friends and family will not be wearing your pants. The fit of the club should not be your final consideration.
College is, by nature, a very selfish time in life.
You are your own sole responsibility. Do not forget that it is also your job to help improve others. The University is not Charlottesville and most definitely not the world. There are many lives you can, and should, touch while you have the resources of the University and the time of being an undergraduate to do it. Look for the organizations that really reach out to the community such as the infamous Madison House, Alpha Pi Omega service fraternity, and Phi Sigma Pi service and honor fraternity, just to name a few examples.