Well crap!

[Hawks Coach]

A lot of time the shin splints hurt more after than during, but not always. Take care of them after, endure during. You may find that when your body is heated, you don't notice so much. Of course, if you are on-one, off-one for games it will begin to wear. Tough it out if you can.

Sounds like you have good cardiovascular fitness, so you are fit, just hurting a bit. Hopefully you can hide the pain. Can't hide it if you have no conditioning, cause they will run you out of the gym. So this problem is much better than showing up with no aerobic conditioning.