Mumbai -- Despite giving innumerable super hit songs for over last four decades, megastar Amitabh Bachchan still feels uncomfortable in doing song and dance sequences. The legendry actor said he feels singing or dancing "inadequate and useless" while he is working with best professionals in Bollywood. "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 fulfillment and happiness can be one of the most fake expressions ever devised by actors," the actor wrote on his blog. However, the actor is not able to turn down such offers and has recently agreed to dance on the new version of his iconic song My Name is Anthony Gonsalves in Bol Bachchan.