Do I know when somebody is reading my mind?

We are born with secure knowledge that "we are not alone" but inhabit a universe of other beings, some like ourselves, some different. 

This knowledge is built-in, not a product of experience (which might, after all, be misinterpreted or delusional). 

This built-in-ness is why the existence of other minds cannot be proved, and why solipsism cannot be refuted. 

(The same applies to the existence of god/s, spirits, life persisting beyond death etc... All built-in.) 

 

This innate knowledge of the existence of other Beings, other minds, suggests that there is a background and mutual knowledge that we are in-touch with others; on the basis that if we are aware of other minds, then other minds must be aware of us. 

So, it seems likely that we cannot know another Beings thoughts without that Being also "knowing that we know" - but we moderns are only seldom aware (perhaps for some moderns never aware) that we do know of the existence of other minds. 

Awareness of others forms a kind of unconscious background to our lives - something like an ocean of unconscious mutual which we inhabit and largely take-for-granted*. 

This picture would fit with the idea that the direct - i.e. not-mediated by perceptual awareness of other remote persons (i.e. persons beyond sensory contact) is real but unconscious. 

Which implies that  although few (modern) people seem ever to be aware of their minds being read - this is actually happening - but is either not conscious, or our consciousness of this is denied because it "makes no sense" on the basis of modern metaphysical materialist assumptions. 

Therefore the answer to "Do I know when somebody is reading my mind?" is: 

Yes, you do know; but you are (probably) seldom, or never, aware of this knowledge. 

A further implication is that - since our minds actually are being-read, just as we actually-are reading the minds of other human-beings (and other-beings); it is also plausible we might become aware of this innate, direct mutual-contact between our own mind and the minds of others. If we want to become aware, and if our basic assumptions allow for the reality of mind-reading. 

*In other words: telepathy is real.