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You'll like your 21
I have a 20, and have been shooting the 10MM for years. Same frame. They take bigger hands, but are very controllable. you do have to get used to the safe action trigger. I have a laser sight, and spent a lot of time dry firing it at first getting the feel of the trigger.
No, you didn't make the best deal on the gun, but you got what you wanted. I came into this conversation late, but if you feel you need/want another loader, I'll give you one. I have a couple, and while they're better than nothing, only by a little. I use the UPLULA loader.
I shoot some comps, and your thumb would be kinda tired after jamming rounds in for 200 in a couple hours.
Shoot it all you can, and become proficient with it....
When the day comes you need it, there won't be time for practice!