I'm going to yell at my mom about my hair
Why would you yell at your mom over your hair?
She's always complaining about my hair, it's so annoying.
That sounds really frustrating. While it's not okay to yell at your parents, it's also silly of her to make a big deal out of something trivial like your hair.
I don't find it to be a small issue.
Can you explain what she says about your hair? If you are an adult you can find your own place to live away from her comments if you find them hurtful.