how come i'm paranoid about my garbage can having water at the bottom of its well?

so here's the thing.  i've always been a little weird.  i'm not normal.  i'm pretty good at mathematics tops in my class easily with no problem or effort.  solved questions no one else in my whole class of hundreds of people can solve.  didn't practice it either.

but i worry about things.  i don't want to phone for a new garbage can if it breaks.  so today i was relieved to get the garbage can back from the alley before it rained.  i figured with the garbage can lid open the water can pool at the base of the garbage can.  oh no!  then it can create a hole or eat into the plastic.  i thought some more and thought well what about ketchup.  aren't there more acrid/acidic/extremeph things that are worse than water?

if i'm okay with ketchup and dirt and mud in the garbage can, what's so bad about water.  but it's the water that  makes me nervous.  what about the lid and exterior of the garbage can?  that's plastic too.  couldn't get wet from rain or even snow sitting on top of it and stuff.  if rain or snow is okay, what's the harm in water at the floor of the inside of the garbage can?

but water at the bottom inside of the garbage can makes me nervous.  don't know why.

secondly, my friend, who is also ill - just like me - didn't want to have his usb thumb drive in the usb port too long because the weight of the thumb drive might screw up the port by torqueing it too much.

what's going on with our thinking?