A charming little poem about secrets and trusting others. :)
These are more minor errors, but if you want to streamline your poem, I encourage you to go back and groom them with an edit:
Everyone is singular, which is why we say "everyone /has/" instead of "everyone have," so you can change the pronoun in line two to "he" or "she," I suppose, though you don't have to if you think "they" is more appropriate in the context of the poem, though not grammatically.
"Your's" is correctly spelled "yours," without the apostrophe. "Your's" means the object belongs to someone called "your," but "your" is already a possessive pronoun - just add an s, and you're good to go! :)
There's a typo in line six, and there is some odd capitalization in the last two lines, but many poems take advantage of odd capitalization as a poetic technique - just make sure it's a strategic use of capitalization, and not just shift-key errors.
All in all, it's a charming little poem, funny and true, with some good advice nestled in the lines. Keep writing! :)
This is true. Actually, I am the one who people put their trust in - I know a lot of my friends' secrets, so I am the keymaster. XD Though I never tell anyone, so I suppose that's the reason why people tell me their secrets in the first place.