You're trying to hold down your job/studies while raising your child/pet/houseplants and maybe also doing a couple of part-time jobs but also volunteering for a handful of committees/projects/whatever. There aren't enough hours in the day to do all this well, or even adequately. How do you avoid feeling like a complete failure? Well, friends, obviously you need to drop the committee and stuff. And then you need to rethink what the problem is here (spoiler: it's not you) and what really matters (spoiler: it's not the stuff you're worrying about).
Rachel Aviv's profile of Martha Nussbaum in The New Yorker is here.
References:
Brooks, D. 2016: The Road to Character (Penguin).
Harmon, J. L. (ed.) 2007: Take My Advice (Simon & Schuster).
Palmer, P. J. 2009: A Hidden Wholeness (Jossey-Bass).