How to stop feeling bad about your associates disliking you?

I recently became a TL last month and I only have 3 associates. When I became TL I had a feeling one of the associates didn't like me and recently, someone told me they heard this associate telling someone they really disliked me.

I know people say just ignore them but how do I do that? How do I ignore these people and ignore the thought of "Why?" I know not everyone will like me but I keep having so many questions as to "Why? I try my hardest." I know it's dumb. And I really want to ignore these thoughts.