What is something you wish you had known sooner?

I wish i could known sooner that i would be happy, i had a bad years, thinking about bad things, but now im so happy with my life, anyway, i thought i wasnt going to be happy never :c
Well so deep, better say: i wish i could known sooner that trump would be president to go Mexico, eat nachos and say "ndele con ese pinche trump quiere construir un muro" before he tells he will build it