What lesson that you didn't see when you were younger and now can see, you would teach to your younger self?

I'm in my 20's and I consider myself a complete ignorant, in the sense that whenever I make a decision I always think "What would the future me do if I had more experience/knowledge?"

So taking advantage of this space in Lemmy, what lesson that you had to learn by force or that you learned by experience that when you were younger you didn't see you would teach your younger self?

And I mean lessons like: I must learn to love others, or I am worth more than I think I am.