apple music accidentally charged me money for a subscription that I did not make out, because I have a family subscription with friends

Read the first paragraph and then go to

https://reportaproblem.apple.com/?s=6

in summery go to the link provide above and sign in then

If you see the "Report" or "Report a Problem" button next to the item that you want to request a refund for, click it.

Follow the instructions on the page to choose the reason why you want a refund and submit your request.

See Share App Store, iTunes Store and Apple Books purchases with Family Sharing – Apple Support:

With purchase sharing, one adult in your Family Sharing group agrees to pay for any purchases from the App Store, iTunes Store and Apple Books. You can then see and download your family members' purchases from your iPhone, iPad, iPod touch, Mac, Apple TV and PC, and enjoy them too.* Follow the steps below to download family members' purchases to your device, and learn where to find those purchases if you can't see them. 

If you are the family organizer you undertake to pay for anything not already covered by store credit. Make sure you don't get taken advantage of.

tt2

Thanks for using the Apple support forms

if you would like a refund look here

https://support.apple.com/en-us/HT204084

No worries, the link from Ask_me_about_tech_stuff should be what you need then.

tt2

This is a public forum. You should not post screenshots that reveal any personal information. We're fellow users here. You need to talk to Apple Support directly to resolve any billing issues.

tt2