It really depends on your school. About half the girls in my pledge class are Sophmores (even one girl who is 21), but it really all depends. I would say my school is averagely competitive, but we happened to have a majority of sophomores going through recruitment. If you go to a very competitive school, such as University of Alabama for instance, I know it's completely different.
Just go through recruitment thinking positively and don't worry too much about your status! (You are technically still a freshmen, I'm guessing, credit-wise anyway)