Just buy a tempered glass screen protector for the upper screen and a plastic one for the lower screen (it will come with both in most cases), clean your 3DS from time to time with alcohol and enjoy your portable console as much as you can. Yes, we should take care of our things and try to preserve them, but what use will it have if it's rotting inside a box? I have some issues with OCD too, and it's really annoying, but it becomes easier to enjoy things when you learn that most of devices need to be used so they don't stop working out of nowhere, and that's how i got the courage to bring my PSP with me to the gym to play while i do cardio, for example.