I'm going to get a septum piercing even though my family hates them
What's your family say about them?
I keep getting told I'm too much of a child and it gets on my nerves
It's important to respect your family, however, you do not have to give in to all of their opinions.
I think I'm going to go get it then as I'm still mad.
If you still live with your family, you may want to wait until you move out so that you do not create unnecessary tension in the home.