I mean this in the nicest way possible, friend.
You can get anyone to sponsor a step team, even a woman. If you want to be the best steppers, find the best adult steppers on your local college campus or in your community and ask if they will coach you.
If you want to be MENTORED by my fraternity brothers, then you can click this link and find a chapter close to you:
http://alphaphialpha.net/SearchChapter.php
Please note that ANY good Alpha will tell you that your focus should be on your education and finishing high school first. We will not train you to be future Alphas, Junior Alphas, Alpha Men of Tomorrow, or Alphas in Training.
So write a nice letter to whichever ALUMNI chapter is closer to you and make sure one of your parents or a teacher looks over if for you. Tell the members who you all are, where you go to school, and why you would like to be mentored.
If I was in an alumni chapter which received such a letter, I would be quite impressed and inspired to reach out to create a mentoring relationship with your group.
But please, please friend.... make sure an adult proofreads your letter first. Perfect grammar and spelling are a must.