Baseball Training Swing

Why in sport sometimes you can’t give all your talent?
I play baseball and somedays happen that I swing very bad, I don’t understand that thing, is happens that I can’t touch a ball and can’t hit good as before. It happens also when i’am training everyday. Why happens this to me? I am the only one or it happen only on baseball?
For example: every day I swing like 50 corns, first with a wooden broomstick and then with my wooden bat to improve the contact with the baseball, and today for me it was very difficult to hit 1!!! Can you believe it? it is like my swing motion changed.
this is happening to me with basketball too.
It has something to do with brain…
Like when you throw corns then swing it but at the game your opponent throws it and you feel like you don’t have control so you miss.
How to improve your baseball swing

