Who cares about if someone popular, you'll become popular once you cheer
Every other stereotypical cheerleader always becomes popular. Then once that happens, they use pounds of makeup to cover up their low self-esteem so they don't become a loser towards their fake friends. In other words, you're better :D
Trust me your team will be more accepting of you than you think ^.^ im an alternative/punk girl and definitely not the cheerleading type and yet im part of the family :) dont be worried
Be yourself. If people think down on you, who cares? Is there opinion gonna matter after High School? No.