The 31-year-old actor, who is currently shooting in Bangkok for his next film, was having a Q&A session with his fans on Twitter.
When a fan asked what is his biggest fear, Sidharth replied, "loosing a loved one".
The "Kapoor & Sons" star has had a great run at the box office, but fear of failure is something which does affects him and is something which motivates him to work harder.
"It's my driving force," he said.
After Varun and Alia people are expecting to see Sidharth on "Koffee With Karan". Sidharth said he will shoot for the show as soon has he is back to India from his shooting schedule.