Got my first handheld. RP 5. Super nice looking. Ergonomics are really a disappointment. Any advice?

Long story short, I have been lurking here a long time. I finally pulled the trigger and bought what I thought would be a perfect entry into this hobby/medium, the RP 5.

Looks awesome. Sounds amazing. Hurts my hands like crazy. I'm not a big guy, and this thing makes my hands feel enormous. I don't have the money to just buy another device, hence the long time lurking. Any suggestions?

Edit - Thank you all for your responses. Seems like it boils down to purchasing grips or reselling. As far as I can tell, returning/refunding isn't practical.