Check the subscriptions page for your account. Does it list Apple Music Individual or Apple Music Family?
View, change, or cancel your subscriptions - Apple Support
The subscriptions page is the location to change settings for a subscription, such as changing the subscription type.
If you received an email about the other subscription type, without other clues, then verify its authenticity, as it could be a phishing attempt.
Identify legitimate emails from the App Store or iTunes Store - Apple Support
Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support
If you noted a charge on your bank statements, then check for other possible reasons:
If you see 'itunes.com/bill' or an unfamiliar charge on your statement - Apple Support