I think, when you are in a group you felt some sort of inferiority complex
.Thats why you are always worried about the comments and jokes related to you. Don't worry about those things. Because each persons have their own individuality, personality and capabilities.At the same time a lot of weakness also.Try to understand you and your friends having same abilities and talents but in deferent ways. So be confident about your self. Try to study and practice yoga
and some pranayama. Deffenetly it will help you. Best of luck.