This is why I preach to my guys that not everyone progresses at the same rate. Just because your 15 year old buddy is throwing 88-90 doesn’t mean you should be too. Everyone is different, there’s nothing wrong with that. Work with what you have and try to improve every day
Late bloomer pitchers find their potential at 26 years old.
A youth coach has no way of knowing who on their 12U team will be the best at 26 years old.