I see that your signature says you are from California. So here is the California High School Rodeo Association website. CHSRA | California High School Rodeo Association
As the organization name implies, it is a rodeo association for High School student only. They have all the rodeo events, plus cutting and rodeo queen. You can check out the website for more info on being a member. And actually, the rodeo season coincides with the academic school year. So the new rodeo season will be starting this fall!
Also, here is the National website. So there are National finals that you can qualify for, if you place 4th or better at your State finals for your state high school rodeo. NHSRA
There is also a Jr. High Division now, (I don't know how old you are) so if you aren't in High School yet, the Jr. High is a nice introduction!!