See the following Apple articles:
How to cancel a subscription from Apple
How to cancel a subscription from Apple - Apple Support
View your purchase history for the App Store, iTunes Store, and other Apple media services
View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support
If the subscription that you want to cancel is not listed
If the subscription that you want to cancel is not listed - Apple Support
does this mean someone is using my apple id for gaming?
Create a strong password for your Apple ID, It is best if your password consists of eight or more characters and include upper and lowercase letters, and at least one number. You can also add extra characters and punctuation marks to make your password even stronger.
Never provide your password, passcode, security questions, verification codes, recovery key or any other account security details to anyone else.
See also -> If you think your Apple ID has been compromised
If you think your Apple ID has been compromised - Apple Support