Do you have kids? Go ahead and feel free to use them as an excuse for never writing. Nobody will second guess you. Hey, your kids have to come first, right?
Do you have a stressful, time-consuming job? Yep, you can use that as an excuse for not writing too. It's an excellent excuse. It makes you seem hard-working, and everyone will understand how you're just too worn out at the end of the day to write anything.
Hey, and if you have kids and a stressful job, you can combine them into a bulletproof excuse for not writing. Nobody will ever call you out on that one. You'll seem so responsible, with all your priorities lined up perfectly.
All you have to do is come up with one or two conveniently bulletproof excuses that no one will criticize. Yep, go right ahead: silence that tiny part of your brain that's still trying to get you to be a writer, an artist, a musician, a poet, dancer, composer, or any of a million important art forms that are far more important than your unremarkable, and poorly organized, day-to-day life.