I don't ... it
I've never used it.
I'm not worried about it.
I hardly care about it.
What if I can't manage?
J'ai beau faire, je ne m'en sors pas très bien.
No matter what I do, I don't manage very well.
— Audition (2000)
I wouldn't worry about it.
Je ne m'en réjouis pas non plus.
I'm not looking forward to it either.
— Astérix & Obélix : Mission Cléopâtre (2002)
Je ne m'en tiens jamais à des règles aussi stupides que celles-ci.
I never stick to rules as stupid as these.
Je ne m'en approche pas, le regarder me fait déjà grossir.
I’m not going near it—just looking at it already makes me gain weight.
— Une seconde mère (2015)