I think people underestimate how tired you can be from just having too much on your mind! Not even physically tired! Just tired of remembering things, handling things, thinking ahead, fixing stuff, making decisions, being needed, tryna stay afloat etc. That's just a lot for real.
You gotta maintain a lightness to your heart because turning into a bitter loser obsessed with how people have done you wrong is the most off-putting and unrewarding way a person can choose to be