I think when a rachel becomes rach I automatically pronounce it as wretch in my head
Does this derogatory thinking make you feel more superior? Is it a positive thing to you?
A little bit yes However rach is my preferred nickname.
Sometimes we think of silly things in our head. You won't hurt anybody if you keep in your thoughts.
Sometimes I post my thoughts about it online
It's quite healthy to express what's bothering you! It might be silly to others, but it's a valid point that's personal to you. Hopefully you can overcome it someday.