Phill Wade taught for 12 years. He had an engineering degree, an Army ROTC background, two educator parents, and a classroom full of students counting on him every morning. By every measure, he was exactly where he was supposed to be. Then a video he made for fun went viral, and everything changed. During the early days of YouTube, Wade posted a clip impersonating R&B artist Trey Songz, which landed on WorldStar and caught Songz’s attention, pr…