Use Auto-Suggestion for Approval

Repeat to yourself slowly and calmly again and again, even hundreds of times, "I do not need the approval of others," or, "What others think of me does not make a difference."

Contemplate these thoughts until you start to internalize them. Repetition will help you integrate them. Realize that you may have repeated many thousands of times the need for approval of others. Counteracting these takes many repetitions.