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Valid reasons (in my opinion) to not play High School Baseball:
Injury concerns. Arm getting abused by coach. Coach not willing to change the arm abuse.
Other than that, unless the Coach is a complete sociopathic criminal, or engaging in overly excessive behavior such as punching players in the face, telling pitchers to intentionally throw at opponent's heads, sexually harassing the player's Mom etc, I'd say go play...
Only slight overuse issues...
I would say that learning to deal with that pressure is a good thing... embrace it.