The OP is 17 (unless I messed up that math, which is totally possible) born in 1987 (how scary is that)
If you are serious with your post, enjoy life, become a legal adult, get your first real job, let your car insurance rates go down and then worry about marriage.
My letters define an organization I'm a member of and ideals I strive for, they do not, in any way, define my personal relationship status. Your status with a greek organization has no barring on your relationship status. Anyone who would tell you different is on crack. Maybe I'm getting old, but I figure I'll live to be oh say 80, which means that if I got married tomorrow, I could be married for 57 years. Why not live a little, figure out who I am, date different types of guys and let things fall into place rather than rush.
btw: How are you going to join a sorority when your school has no greek life?
edited for spelling