I want to try and help but I'm starting to feel like a monster.
Why are you feeling like a monster?
I feel like I am  being too narrow-minded with my good friends.
It is good that you recognize that you are becoming narrow-minded with your good friends. If you feel like a monster because of this you should try to change on how you behave.
Do I need to just let my friends do whatever they want?
If you have bad feelings about how you treat your friends then it might be good to change your approach.