I have received notifications from Facebook via my Yahoo email address, but when I click on the link the page opens in another username with a first name the same as mine. When I click on their settings, it shows that they are using my Yahoo email address. I cannot log in using my password, or delete my account, as every time I try to do so, my page comes up with the other users details. It seems that FB has changed my identity and I cannot understand how that happens. I cannot contact FB using my own identity to inform them that my account has been hacked into or changed by them.
Can you please help, as this is worrying me desperately and I just want to delete my account permanently now.
Thank you in advance if you can please guide me through this mess.