I can’t log back into my old account

So I cannot log back into my old account, I know it still exists, I can find it via username on the Xbox app and my friends still have the profile added and friended on Xbox itself. But when I used the email i thought was associated with this account it logged me into an account I do not ever remember creating with none of my purchased games, which is the part that bothers me. I have an account that still exists with games that I payed for, that I cannot play. I tried all my other emails and I just cannot seem to log back in. If anyone has any idea on what to do it would be greatly appreciated

:)