Skills I learned incorrectly and now can't correct

¯\_(ツ)_/¯
  1. Using chopsticks: I hold them like pens
    Realized this at 21
  2. Holding pens: Idk what I'm doing wrong but I know it's wrong
    Realized this in grade school
  3. Holding bowling balls: I use my thumb, index, and middle fingers
    Realized this sometime in late teens
  4. Positioning floss on my fingers: I wrap it around my index fingers and cut off circulation every night
    Realized this sometime in my 20s