Whenever you receive a card, letter, email, evaluation, recognition at work/school, add it to your box or journal. When people give you compliments, put a little note in your phone or directly in your box/journal of what they said.
Then, whenever you are struggling in your ability to remember and recognize your inherent worth, pull out your box/journal and indulge yourself in all the nice things people have said about you.
You can either make your own box, or purchase one of your liking. If you prefer, just tape or glue your compliments into a journal.
Afterwards, spend some time really absorbing the good vibes of these statements. Listen to some meditation music on YouTube that inspires a deeper feeling of self worth or a guided meditation that promotes healthy self esteem.
Breathe, believe,feel and KNOW you are inherently worthy just as you are. Return to this activity whenever you are feeling down on yourself