Guilt, Whack-a-Mole, and filling my own cup

I got to go to a yoga class today and at one point the instructor advised us to "be present" and clear our minds of our to-do lists and anything else we may be thinking of. At first I mentally balked at that thinking, "Why should I concentrate on being present now? I want to save my being present energy for important moments like when my kids are trying to tell me something I am not actually interested in." So that made me feel guilty about not actually being interested in all the things they want to tell me. Then I got thinking about how I usually don't feel guilty about a lot of things, or when people talk about how LDS women feel more guilt than they should be, I usually think that I am not part of that category. And that got me thinking about the whack-a-mole analogy I have used throughout my life to describe the feeling I have that as soon as I get one problem solved, another one pops up, and so on. I most recently used that analogy while talking to Rebekah on the phone about something really important like, "Is it right for us to spend money on dance class for our kids when other kids are starving in Africa?" and my kids one by one started having emergencies that needed my immediate attention. Don't they always need my attention even when it isn't that they sprained their fingers or had a poopy accident? Then I got thinking about how, they don't always need my attention, because I do need time to "fill my own cup/bucket/balloon" so that I have the physical emotional energy to help them, I mean isn't that why I think that going to yoga class is justifiable in the first place? So maybe I should try to clear my mind and focus on my breathing, and be present.