It's Greek to Me. Going Greek may be your answer.
People often say that the friends they make in fraternaties or sororities last a lifetime.
This gives the individual a chance to learn more about each chapter and for each chapter to formally seek out new members. They're free and place no obligation on you. Meet members of all the different organizations before you decide on the one for you. If the chapter has a house, stop by at times other then the Rush event. This will give you a chance to meet members informally.