London, October 6 Robbie Williams has confessed he is too scared to return to tours as the last one left him with a nervous breakdown.

The singer hasn't hopped on the stage since his Close Encounters jaunt three years ago.

"I cannot imagine touring in the near future. I've smashed my head against a wall too many times. I know it's harder than I am," the Sun quoted him as saying.

The former Take That star performed five nights but later gave up due to exhaustion.

He added: "I felt great when I started to promote a record but it soon began to kill me. I felt worse when on tour. I suffered a nervous breakdown and checked into rehab."

However, he is due to begin the Electric Proms shows in London on October 20. (ANI)