Are you wearing gloves? Have you tried riding in the drops? Maybe try stretching your hand a bit before and after riding, and shake them out. If it doesn't get better, you may have a fit issue, but I think it may be temporary new bike pain.
ETA, if you think it's a brake reach issue, there are both shims for brake levers, and short reach brake levers you may want to try if you don't already have them.



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