Do something for yourself only. Something that makes you happy.
It can be very simple: write poems, take care of a beautiful plant, make diy jewelry, learn yoga poses…
These things you accomplish just for you will bring not only joy, but also a special kind of strength.
Whenever people make you feel not worth it, whenever you make a mistake at work or in any other circumstance, whenever your self-esteem is hurt, you will have this, keeping you strong.
Because when you do something for yourself, and progress doing it, it makes you believe in yourself. It gives you confidence.
That no matter what happens, you know you are good at something, you know you can accomplish things and grow endlessly. Nobody can make you feel worthless.