Answer:
I am an object which is used in baseball during the day I can't be seen at all
If you have me you want to share me. If you share me you don't have me. What am I?
I never was but always will be. No one ever saw me but everyone knows I exist. I give people the motivation to better themselves everyday
I'm a word that is not even strange. What am I?
I rise and fall no matter what, only at finals rest do I not budge. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.