Make sure your family is there to watch the grope down, and if you are touched in a way that is inappropriate, you should SCREAM.
Also make sure to file a report with the ACLU here if there is abuse:
http://www.aclu.org/technology-and-l...n-search-abuse
Fortunately as a 17 year-old girl, you will have a lot of sympathy that would not be available for older people or for males.
Good luck!