There are way worse nicknames...
I would spice up the nickname with a bit of a french pronunciation or emphasis on the "stache" part of mustache, make it sound exotic.
But you are a good-looking dude. Put on some muscle, get shredded and you will absolutely fucking slay the girls
Yvonne Walker
Phil Will
Emmie Lou
Jonathan Birdman Martin
Simon Balzan
Mera Tumpang
Kaitlyn Shepherd
Jessica Bell-McLean
Seniorita Signiscia
Tina Blanton