Do you live with anyone else, and do you have a password on your laptop? I feel like this totally could be someone you live with just fucking with you lol

You might want to try r/cybersecurity_help.

I would not use that laptop for anything until a complete OS reinstall, in case there’s a keylogger, or something like that on it.

You should probably also change all your passwords (from a different device), and enable 2FA if you haven’t already.

You could try using Autoruns to check your startup applications. “OpenJDK platform binary” is just something used to execute Java applications, so that doesn’t really mean much in terms of if it’s safe or not.