I don't see yer desire to learn new skills as a "character flaw". I see it as a strength.
I'm constantly learning new skills. Some folks (like you and I) have to learn new things to be fulfilled.
My wife likes to tease me about learning something new, and then moving on to learn something else, as if I'm done with whatever I learned. The truth is, the wheel keeps turning around, and all my old hobbies come back around. I learned to brew ales somewhere around 1987. It was an on-again-off-again hobby until about ten years ago when I got serious about brewing in Albuquerque and started winning a few awards. I quit brewing for two years when I moved to northern NM, but have been brewing again for the past couple years... no competitions like before, now I just keep two ales on tap in my home kegerator. Nada fancy, just the same two recipes to keep cheap tasty ales on hand. (A honey brown, and an APA.)
I garden and hunt, but not every year. Fishing is one of my few hobbies I just can't get enough of. I will go months baking a couple of loaves of artisan bread each week, then go months without even thinking of baking.
Some skills I only learn to KNOW the skill, then don't really mess with any more. Knapping flint, and knitting come to mind.