persuading my parents to let me get a tattoo

Tiana
So I'm 16 atm and I really want a tattoo. I've been putting a lot of thought into what I want as I want it to be meaningful and special and this is what I've come up with. A purple semicolon it's particularly special to me as this is what it represents to me. 
Purple- colour of domestic violence, my mum and I were victims of it and honestly still are at times. 
Semicolon- represents hope and strength, choosing not to end your life and self harm. 
Please let me know your thoughts on the idea and ways to get my mum to agree. Oh and I'm thinking of getting it on the back of my neck or behind my ear if anyone has a tattoo there please share your experiences!!