The star finished her eight-year relationship with fellow actor John Abraham in 2011.
She told The Times of India: "After the break, I realised that it was tough and newer entrants had made their positions stronger in Bollywood.
"I was no longer excited about being a decorative piece in films. I would love to do all the movies that preferably a Nicole Kidman has done.
"Even if the actresses in 100 crore films are criticised for being there for item numbers, I feel it's not fair. In this industry, the going is harder for the female actors. Let us be honest, everyone is vying for a The Dirty Picture role.
"It's a brutal world out there. If you consider the case of superstar Rajesh Khanna, he was a darling of the masses in his heydays and his fans resurfaced only after he passed away.
"Such is the life of actors, one gets so addicted to fame and glory and then it is very difficult to accept a fall. You are forgotten and only remembered when you die!
"There will be times when even your best friends won't acknowledge you here. Only when you die, people will start shouting, 'She was a hot actress, a diva, an iconic actor'."
The 33-year-old actress has previously admitted that she had a breakdown on the sets of her upcoming supernatural thriller Raaz 3.