Chipping away from my belief

I have a perfect niche in mind. I love that niche. I have even made lots of money in that niche but I am always chipping away from the full belief and scaling with it, because another coach is super successful in that niche. And I tell myself, I am second. I have no chance. No one will love ME. She has captured everyone. And I feel I need to really let go of this thinking and commit to it wholeheartedly to grow and give it my all. Coaching please.