please refer to: https://www.xfinity.com/support/articles/spam-filters-and-email-blocking-new-experience
Check your settings under "Auto Forward" and "Filter Rules". It appears your email has likely been compromised and someone set up rules that deletes all your emails. Be sure to change your password along with running Anti-Virus and Anti-Malware scans on all of your devices. Consider setting up two-factor authentication under My Account as well.