Writing on his blog, the 69-year-old actor revealed that he feels "inadequate and useless" singing or dancing on film.
Bachchan wrote: "Song and dance have always been a major crisis for me. Moving, singing, expressing among some exquisite professionals, makes you feel so inadequate and useless.
"Covering up is also a major deterrent. We are seen and observed in song, unlike perhaps an acting scene, where one could merely speak to a wall and not have the compulsion to face the camera.
"But here in song, with the broadest smile, giving impression of great fulfilment and happiness can be one of the most fake expressions ever devised by actors."
The actor, who will recreate his iconic song 'My Name is Anthony Gonsalves' in Bol Bachchan, confirmed that he will also lend his vocals to the song.
"I work tomorrow on the Bol Bachchan song, one that I have been asked to sing and perform on. I have through the years discovered, that lip syncing your own singing can be most tormenting."
Bodyguard star Salman Khan was reportedly planning a remake of Amar, Akbar, Anthony, but has shelved plans for a modern-day version of the film.