Today, I opened my mailbox and received an email from myself. The content says that my browsing habits and some videos are monitored, so let me call him Bitcoin.

Dude, your mailbox was hacked, which should be the same as your computer was hacked. They will ask you to give them a certain reward or compensation before they can restore it to you. So, buddy, try to get rid of it quickly and find a professional to show you where the IP address of the other party who showed you the email is. In short, find a master to deal with it quickly, don't take chances, in case your privacy is yours.