How can you check to see if you have created an Apple ID?

You have an Apple ID. You used it to sign into the Support community.

If you are looking for another Apple ID.

See if you can recover the ID/password.

Apple ID - How to find your Apple    An iCloud e-mail address is an Apple ID.

Apple ID - Find

Enter the Apple (iCloud) ID and click Forgot Password.

Apple ID - Manage            

Apple ID – Forgot Password