Just because your college years are over does not mean that you will no longer be able to participate in social outreach programs. Consider a year or two of post-graduate service to determine if this is your life's calling. There are a myriad of organizations internationally and domestically that are interested in working with you.
Samples of some are:
Amigos de Jesus
Associate Missionaries of the Assumption
Jesuit Volunteer Corps
The Haitian Project
Friends of the Orphans
Teach for America
Habitat for Humanity
Domestic Links and e-mail addresses to domestic service organizations.
International A description of international service organizations, requirements and web addresses and contact names.
Teaching A listing of organizations and websites that have post-graduate teaching opportunities.
Secular A description and listing of websites for secular service organizations.