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Tinsel Talk: What advice would you give your 17-year-old self?

By Heather Newgen, Carrie Bell, Jessica Wedemeyer and Gena Oppenheim Slide 1 of 28

Oh, to be young again. There are so many things we'd do differently -- and apparently there are quite a few stars who share the sentiment. With graduation season upon us, it's time to reflect on growing up and the things we wish we'd known when we still had our entire lives ahead of us. Keep clicking to see what advice Shailene Woodley, Jared Leto, Jon Hamm and more stars would share with their 17-year-old selves.RELATED:Celebs who put carriage before marriage"I would say do exactly what you did." --Matthew McConaughey
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