I had a hard enough time in high school, fitting in without having to keep up with Instagram, Twitter, and Facebook - all these ways you have to keep up your image.
My biggest beauty tip would be exfoliation, exfoliation, exfoliation! After a lifetime of almost no breakouts, I learned that if you don't exfoliate, your skin has a hard time shedding the old skin and therefore clogs your pores and causes zits.