Lol... I'm not 17 either... all you have to do is find one person who is... pay him for the ticket and ask him to buy it for you. Once you have the ticket they assume you had to have shown proof of age to them to buy it in the first place, so they let you in without checking ID (unless you look really young I assume)...
I've never had a problem with it... and I sure as hell won't for this movie 馃槈