So I previously had a subscription to Apple Music and then my mom got a iPhone and put a subscription to family sharing do I cancel my subscription to Apple Music?

No. If you cancel before joining the family plan you may lose your music library. See the footnote in the 'First, set up Family Sharing' section of:

Get an Apple Music family subscription - Apple Support

"If someone in the family group already has an individual or student subscription to Apple Music, renewal of that subscription is automatically canceled when they join the family group." And you will retain your music library.

so i’m on a family plan i had to sign out of apple id for some issues i was having. when i signed back in it says im still on the family plan but it’s not allowing me to access apple music anymore somebody help

You might be able to fix your issue by turning Sync Library off for all of your devices, then turning it back on again.  Learn how.