If you want to check if your existing channel is Brand Account or a User account then follow the below instructions.

1. Go to www.myaccount.google.com/brandaccounts. You will need to sign in first. 
2. Check under "Your Brand Accounts" to find your associated Brand Accounts. 

• If you find your channel name under Your Brand Accounts it means it's a Brand Account, if you don't find your channel name it indicates a User Account.