Comfort zones

Hi all,
I've recently been put in a position where a have to do a forward roll in front of lots of people, which is difficult for me because I've never been able to do a forward roll. It's always been a movement that has eluded both myself and my body. I was asked to do this roll for a gym competition, and I stood there crying while everyone else in the group was practising the routine. This would be a post about facing your fears, but unfortunately it does not beckon to the average opinion. I feel that, if you are truly uncomfortable with what you are doing, even if you find it difficult trying it in the first place, then you have the right to say no. Especially in places like school or work. They are for you to enjoy and learn stuff about life, not for you to have a bad day based on one activity you are being forced to do. If you aren't comfortable, then tell a supervisor how you feel, it's in your rights as a human being. However, try to encourage yourself to do it, because it'll do you no harm at the end of the day (that's what I did wrong - I didn't even try).