If you are under 18, you might want to wait.
If you are an adult, your name is your own. Find a name that fits you, and own it 100%.
No promise made to anyone should lead you to break the most basic promise to yourself: Be you.
Apologize if you feel you have to, but you can't hold off saving yourself from drowning because someone else might get wet.
Moms worry and some moms fuss, but when they see you happy and well, it calms down eventually.
I kept my last name because I wanted to honor my birth family.
But my given name only fit the person they thought I was when I was born.
I was reborn, and rebirth requires a renaming. I have never regretted it.