I'm so sorry. Does your campus have Alpha Phi Omega or another service GLO? While these wonderful organizations are not a substitute for a "social" organization, you said that you are philanthropy-minded, and these orgs offer a focus on service with the long-standing traditions of other fraternities and sororities. I had a great experience with Alpha Phi Omega in my undergrad years.
Circle K is also a good option if you are looking to serve your community and make friends.
What are your other interests? I made good friends in the college choir. I loved working on my school's newspaper and literary journal. I really bonded with those friends...as in MARRIED the sports editor.
Good luck, hon. I know it hurts right now. I've been there!