“Know your worth.”
Associate only with people who knows how to value you, including those who genuinely helps you grow.
And when people disrespect and undermine you such that you begin to question your value, learn to discern whether you must stay and fight for what you deserve or to just turn around and walk away.
Never, not even for a second, look down on yourself in the same way that they look down on you.
And spare your soul by not wasting yourself to those who do not appreciate. Even the Bible is very clear on this as it was written in Matthew 7:6 (NIV) “…do not throw your pearls to pigs. If you do, they may trample them under their feet…”
You are that pearl.
Read that last line again but this time substitute “I am” for “You are”. Read it again. Slowly. Regularly. Forcefully.