After decades in Hollywood, Channing Tatum finally feels like he’s getting the respect he deserves. According to insiders, the Magic Mike star, 44, has been feeling more confident than ever getting into the good graces of his heroes like Brad Pitt, Keanu Reeves and even George Clooney. “Channing is a relatively modest guy,” the source spilled. “But at the same time, he’s really grateful that these huge stars who used to ignore him completely are suddenly taking him incredibly seriously and trying to adopt some of his techniques for looking half as old as he actually is.” While Tatum’s acting c…