Q: Hi Apple I have a let of music on my devices if share all of my music everyone will have them how secure is this

First Apple employees, while I am sure they read these forums are not permitted to respond. We are all users like you.

Second - what do you mean by sharing with everyone? The only devices that have access to the music you matched with Apple Music are the ones you signed in with your own Apple ID. Your library does not get "shared" with anyone else.