I'm no expert on this because I still in my 30s struggle with anxiety of stuttering and negative mentality. But I've went through periods where I succeeded in things and the only mentality that worked was "not giving a fuck" not caring at all about anything or anyone. And just getting what I wanted in that moment. Unfortunately this mindset could never last with me for whatever reason. But that's really our only option is just accepting that most people are going to think we are retarded or scared and that it's not going to stop us from getting what we want.