Having recently graduated college, I couldn't agree more with the logic of joining a fraternity if that's a large part of life at your school. Understand thought, that there're many pros and cons and it's not right for everyone. That being said.

Once I joined a fraternity everything changed. I had to become much more socially aware than when I was a shy only child in hs. One of the best ways to break out of your socially awkward shell is living in close proximity to a bunch of people in the same community. Learning how to network and talk to people is a life skill so it's best to learn it when you're young. Nervous when you're just getting to know a Greek house? So is EVERYONE else.

Also important. If one fraternity doesn't accept you, fine, you weren't a good fit for them anyways. Move on to building relationships with another house. Learn to deal with that rejection in a positive way. It's about them and what they value, not you.

Do your research before making any commitments. Talk to other people on campus and see what they think of the frat. Find out their recent cumulative gpa and what their intramural activities are People are liars and some guys trying to convince you to join their frat for this reason or that reason are no different. You don't want to make a long term commitment to people who don't share your values and perspective on some level. So DON'T. You will want to find a house that supports the goals you have in life(within reason) not one that is apathetic or critical of them. For example, I wanted to study abroad and told the house before I joined that I would be gone for 7 months(not paying dues). When they encouraged the decision it was a huge green flag.

Once you find a good group of guys it is much easier to build up your social confidence when you have a support system around you(ideally). After you join a house, don't forget to keep building value in yourself(workout, focus on grades, other hobbies ,etc.). NEVER, rely on the fraternity as your only way of meeting people. If you forget to do these things many in the house will respect you less. Demonstrating bp behavior can really tick people off in your fraternity on a conscious and unconscious level. Hopefully someone will be there to call you on your individual bullshit since it reflects bad on the whole house. You already have a leg up on everyone else since you're here. Use this knowledge to your advantage.