What is the difference between kink and fetish?

This site explains it very well:

https://www.yahoo.com/lifestyle/kink-vs-fetish-sex-therapist-030000976.html

This part I copied from it summarizes it:

"There can definitely be some overlap between a kink and a fetish so we understand the confusion. Dr. Torrisi breaks down the difference as “whether it's something someone likes to do or if it’s something someone has to do in order to have sexual pleasure.”

Here’s an example: If one night in bed, you accidentally hear your neighbors going at it and it turns you on, that’s kinky. But, if you need to listen to or watch others having sex in order to feel aroused then that’s a fetish."

when ever I do something fetish, I get a Kink

Kink is using a feather. Fetish is using the who chicken.

No idea.
But kinky is with a feather, perverted is with a chicken.