In a perfect world, this would be a mutual decision and as the child gets older, the decision becomes more what the child wants. The mom would be loving and accepting and cool about whatever the child wants. However, this is not always the case and many parents are dictators about things like hair and clothing. Kids don’t always know best about what their hair or clothing should be. My daughter is almost ten and wants her hair to be long. When I brush her long hair, she cries because it gets big knots in it. I often ask if I can cut just a little off, and when she agrees, I immediately get the scissors out. I just cut about two inches off the other night. Now it’s way easier to brush.
I know when she gets older, we might be getting into it about clothing, tattoos, piercings, etc. I’ll pick my battles and see what the issues are when they arise. I’m cool about a lot of things but I think kids don’t always see the big picture of a career that might not welcome someone coming in with nose rings, etc.
It would be helpful, as others have inquired, to know the age of the OP.
I agree with others it’s not worth a beating, if that is the consequence, to get a hair cut.
The OP might feel that a haircut is worth a beating.
OP @Sam_ , what is your age? What country do you live in? What will your mom or dad do if you do get your hair cut 5 inches off?