Hi Denise_hu,
Welcome to the Apple Community.
Seems most subscriptions automatically renew unless you cancel them..
Apple support have articles online that may help:
(You might want to browse the topics before choosing which one(s) looks most helpful to you.)
How to:
Cancel a Subscription from Apple
https://support.apple.com/en-au/HT202039.
If the subscription that you want to cancel is not listed:
https://support.apple.com/en-au/HT212052
Get help with subscriptions not billed through Apple:
https://support.apple.com/en-us/HT207865
Cancelling subscriptions is slightly different in Israel, South Africa, and Turkey
https://support.apple.com/en-au/HT206627
or
Request a refund for apps or content that you bought from Apple
(Note: If the charge is pending, you canʼt request a refund yet.
After the charge goes through, try to request a refund again.)
https://support.apple.com/en-au/HT204084
Hope something here works for you ! :-)