Selflessness

Being selfless is being there for people even though you need support yourself.
Loving people even though your own heart is breaking.
Trying to cheer people up even though you're going through some stuff yourself.

But you don't always have to be selfless, be selfish once in a while.
You shouldn't have to rip yourself apart to keep others whole.
You shouldn't have to be heartbroken to make others feel loved.
You shouldn't have to cry yourself to sleep at night to make others happy.

So be selfish.
It's not your job to keep others happy if it doesn't feel good for you.
So make yourself happy first, and go think about others later.
Go love yourself first, and everything will fall into place.