I feel the same, it genuinely hurts when I think I let other down (despite they might not feel so).
Compassion is good, but we should probably reserve it for people who are close to us.
For those people who you probably will never meet a second time, close your heart to it.
Works… sometimes. Could never really follow it, tried different versions of it(50-10, 40-20, 30-10) and results are mixed.
I would say not to focus too much on the timer , get up and walk around if you feel like so, just remember to not touch addictive stuff in the breaktime (Video game, YT, etc…).