You've obviously never heard of the Fifth Amendment. It's actually quite the opposite, the Constitution enhances your right to privacy (by refusing to talk about something) when doing so could be used to prosecute you for a crime.
> inside your head
If it is written down, biometric, etc it does not get protection under the 5th. Those realms are not inside your head, and so they are protected by the 4th, and subject to warrant.
This is demonstrably false.
https://arstechnica.com/tech-policy/2020/08/nj-supreme-court...