Answer:
I look like a tiny trombone
I have thirteen hearts but no body or soul.
My first half means container. Not a lot of people understand my language. What am I?
Six letters it contains. Take away the last and only twelve remains. What is the word?
I am an odd number that become even when beheaded.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.