Zac Efron is struggling with the public interest in his substance abuse Thu-19-Sep-13 15:59 Share this By Megan SellersZac Efron apparently went to great lengths to hide his drug abuse and subsequent rehab stint, and the public scrutiny has turned into his "worst nightmare"! Those close to Zac say he kept his substance abuse secret for so long because his controlling nature allowed him to always keep his cool.One source says: “Zac is really good at keeping it together. He’s a huge control freak and has always been obsessed with keeping his partying on the down low, this getting out is his worst nightmare. He cares so much about keeping his private life private.”The source continued:“Zac’s young and he likes to party. But it’s pretty standard in this town, everyone dabbles in drugs, it’s just a part of young Hollywood. Most of them just hide it well and Zac is a perfect example of that.” You May Also Like Zac Efron thanks fans for support post-rehab Zac Efron's rep refuses to comment on rehab reports Nicole Kidman peed on Zac Efron Become a fan of The Edge on Facebook and on Twitter .