you can try resetting the password ***** the account and that should be a good indication if it's yours.
You can use the self-service Google Account recovery feature from your computer to retrieve this information.
Please go to the following site:
If you don't remember your ID, select "I don't know my username" and follow the prompts. It will ask for you to identify yourself as owner of the account in some way (such as phone number, alternative email, etc...).
Once you have the username you can return to the page and choose "I don't know my password". It will then guide you through the step required to reset it.