Your worth as a person does not depend on what you have, what you have done, nor on what you can do.
You are valuable simply because you exist.
The reasons why gold, platinum, and gemstones are valuable are because they are rare, and because they have qualities we all admire.
You are far more rare (and valuable) than any gemstone, simply because there is only ONE of you.
We all start out in life in a "raw form" and we usually need some shaping and polishing before our true value becomes apparent for all to see.
If so, decide that you're worth the effort, and take every opportunity to develop your unique qualities.