Why can't I animate the moments that need real feeling?

You can hit the poses. You can time a take, land a bounce, finish a walk cycle. Then the scene asks for a person to actually feel something, and what comes out is close but empty. You know it. The supervisor knows it. This is not a mystery of talent. It is a gap in what you have studied. Most animators study animation. Good reference is other shots, other reels, other people's solved problems. But emotion was never solved by an animator first — it was lived by a person first. If you have not watched real humans fail to hide what they feel, you have nothing true to draw from. You are copying a copy. You cannot wait until you feel ready to attempt nuance. Readiness is not required. Looking is required. Choose, today, to watch one real human moment — an interview, an argument, a person trying not to cry — and ask what the face actually does. Then put that, not your idea of "emotional acting," into the shot.