Oh my gosh...I've been there! Not with my own kids yet, but I remember when I went to Disney with my parents, and grandparents (drove from Wisconsin) when I was 14.
I have loved Disney since I was 6, and love it to this day.
However, I am embarassed to this day about the way I acted on that trip. When I found out we were going, I was actually mad....because I had to miss, heaven forbid, a school dance. I held that grudge the whole trip, and even told my own grandmother to "shut up", when she made some reference to the dance I was missing. Nice, huh? Not my proudest moment.
But we went again 2 years later (surprised my parents actually wanted to take me again!), and I had a much better attitude, and a great time. That was the trip that really cemented my love for Disney World, that stays with me to this day. We are constantly planning our next trip!
I promise you will get through this. 15 year from now, your girls will be asking YOU to come to Disney with them and their families because they will have such great memories of going with you as kids.
Hugs to you!