Google Account Missing on Device – Urgent Account Recovery Request

I live in India and I am writing about a serious problem with my Google account. My Google email ID is still open and accessible on my father’s phone, but when I try to use it on my own device it only shows the option to create a new account and my old email ID does not appear at all. Because of this, I am very worried that my ID may be hacked or there is some serious issue with my account. I first noticed this problem on 07/09/2026. Since then I have not been able to properly access my existing Google account from my own device and I am afraid of losing my data, emails and personal information. I do not know how to use the recovery options, so I could not fix this problem by myself. I kindly request that you urgently check my account, secure it against any unauthorized access and help me recover full access on my own device without losing any data. I also ask you to guide me clearly, step by step, on what I should do to protect my account and prevent this from happening again.