My bf says no.

So ladies! Advice, since I was 16 I've wanted a tattoo, my parents agreed but I wanted to wait till I was 18. We have a friend of the family that we trust to do it but he's busy, meanwhile my bf who I've dated 4 years says no! He says he likes tattoos on other people besides the ones he loves and will be intimate with. I'd understand if I got a rather unappealing tattoo, but I was thinking super tiny and wrist, finger or ankle. But he still says no. I told him he couldn't stop me.. but i feel wrong bc I'd want him to constant in decisions with me also what do I do!?