My DD, a long, long, time ago, was always chosen for school plays. We always thought it was because teachers recognised that she was confident, from a young age, could learn lines, and follow direction.
I guess it's tough on your child if they've never been chosen (guessing this,because you don't give too much information,your choice and I've no problem with that).
Buy,it didn't mean my DD was any better than any other child. It just meant that, at that time, she was very confident etc