My parent don’t like me expressing my negative emotions. How do I bottle up my negative emotions?

Don’t bottle up your negative emotions.

Learn how to express your disagreement without shouting, calling attention to yourself, or looking like you’re taking it personally.

If you can master this technique, you’ll get away with a little less than actual murder.
; – )

Parents: You need to get a haircut.

You: You certainly have a right to your opinion. Just know that when I’m an adult, you’ll have absolutely no say on my clothes, hair, or sense of style. Are you absolutely sure you want to lay down the law on something as harmless as experimenting with fashion?

Parents: ??????

You’ve probably already encountered peers that offer up no public or discernable resistance to authority figures yet privately do pretty much what they want. Emulate their mastery of secretly bemused detachment and let your parents think they’ve got you under control.