I know it can be difficult to remember account settings on an email account you setup a long time ago.
Especially if it is an account that you have setup to automatically login, and you rarely even visited the account settings.
This is a perfect storm for losing access to an account, even highly important accounts.
If this was an account that resided on a PRIVATE server, it would be an easier task. By contacting the Email Server Administrator.
But because you are using a FREE Google account. They will NOT give you personal service.
Althoguh you can write to them, (on a seperate email account) and explain your situation.
But you MUST have SOME KIND of indetifying information that links you as the OWNER or CREATOR of the account.
The only way to help you further, is to actually connect to your computer, and attempt to reset your password, to verify that your options and recovery accounts are not an option, and you MUST resort to the LONG and arduous process of making contact with google account security, and following their procedures.
To help you further we would have to do a remote connection.
Please let me know when you are ready.