Does this girl have the right to ask like this?

Okay so there is these too girls, lets call them a and b. So me,a and b were all going to try out for our schools dance team.these girls have no dance experience and i have tonssss! girl a is a total beeotch and girl b just goes with the flow pretty much. So when we were at dance team practices, they both were pretty much just going through the dance without actually "dancing" it if you know what i mean. they lacked that omph! me being a dancer for quite some time, i could do the dance with ease and knew it well enough to put that extra flair on it and really make it look good. i thought i had it in the bag. so tryout day comes and i nail everything! the other girls really didnt say anything about how they did. so the next day at school we find out that those two girls made the team and i made an alternate position! all of the other girls who made it were like wtf? how did they make it and you didnt. i said they same thing because they really cant dance. so girl a is now treating me like i am some piece of crap just in her way and she is acting like some queen bee. when in reality, everyone knows that i should have gotten that position, even girl b is such a bad dancer it really makes me laugh when people think they are actually good! do these girls desrve to act like this? what should i do about it because its ticking me off knowing that i should have one of their spots! im not just saying they are bad because im mad, im honestly telling the truth and not stretching it one bit! our first practice is tommorow and i really dont wanna be just pushed around because i am only an alternate!!