Apple Music
If I disconnect my Apple Music that I have subscription to for 2 years now will I loose all my music ?
You will lose any music and playlists you have downloaded from the subscription service yes.
The subscription service is a rental of the music while you are subscribed, you do not own any music you get from there.
Any music that was purchased from the iTunes store directly or obtained from other sources like CDs. will continue to be available.