Don't feel bad. Collegians and alumnae go through the same thing. It can be a bit of a let down after your initiation and all of the attention. On the collegiate level, women drop by the drove after their first full year-- a lot of attention has been given on the collegiate level to improve retention and to see where we are falling short with the programming.
I've been an ADPi for 10 years and I came from a chapter that sings everything... and yet when I attended convention and some district events in other regions, I was still learning new songs that it seemed everyone else knew!
So, AI sisters, you're going through what every sister goes through-- and I admire your determination to learn the ropes and the songs!