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TooMuchEpoxy said..
Sounds like you might be DEATH GRIPPING it. Make sure you relax out there.
This is really important and is a pretty common challenge early on in a lot of adrenaline sports (climbing, mountain biking, foiling)...and not just holding the handles while flying, but generally putting lots of energy (often ineffectively at first) into trying to control everything, adding wear and tear to your body. Learning to relax when/where you can has a ton of benefits (good breathing helps too).
...Also if there is much thickness on the palm side of any gloves you use, that tends to make your hands fatigue more quickly holding on...