You should have gotten over this "fear" well before the age of 15. Not to be unkind, but you are lucky to have won any kind of award with that technique. Pop times and throwing runners out is important, but not more important than mastering fundamentals. You'd better get to work on it NOW. If scouts and recruiters see it once they are going to walk away, unless you can really mash in which case they'll be thinking about what other position you might be able to play. All I can suggest is that you drill constantly. Get someone to help. Ball after ball off the chest protector, glove down, chin tucked in. I think it's probably more of a bad habit than fear. Then, when you've corrected the problem, call every coach you've ever had from age 6 until now and thank them very much for not correcting the problem sooner.