While trying to enter the GTA V game that I got as a gift on Steam, an error on the Rockstar Games Launcher says: Enter the password of your e-mail that starts with "x" and ends with "m". But this e-mail is not mine. My email address is "leedn1903@gmail.com". As far as I understand, my account has been stolen and I don't know how to change my e-mail in the Steam application to my own e-mail again, please help. I know that there is a really high fee for the person who gifted this game to me under the terms of Turkey. Please do not hold back your support.

Thanks in advance.