Can you please check my writing?

This sounds like a message left on a telephone answering machine.
"If you hear this message, please call me. I’ve been trying to contact you for several days. I really miss you. Please, come out of hiding and let’s meet. I’m here now and will continue to wait for your call."

If it is not a telephone message, please clarify and perhaps a different answer is needed.

This is a letter. She or He disappeared so this person who wrote it is missing and looking for her or him!
Thank you!

The problem I would have with this being a letter is the delivery. Writing a letter and sending or delivering it to the last known address would assume he/she were there. If instead this message were put on a club bulletin board, a lost and found web site, or even on telegraph posts around the city, it would need the person's name.
Can you tell me if this is part of a story you are writing

Aha! sorry, it is just a story I'm writing not my real letter.

Then go through the motions of writing the letter on paper and picture yourself sending it. Where? How? Then re-post here your revision.