There are many barrel racing assns. Out there. Just because it is younger girls running pro circuit, don't let that bother you. Very few of us are in it for the fame and money. This is what we enjoy doing. We love our horses and the the friendship of others. If we win, that's even better.
IBRA and NBA have divisions/classes for ALL riders. PeeWee up to Seniors.
Go have fun with your horses.