(Cover) - EN Showbiz - Beyonc Knowles has revealed that despite her wealth and success she still suffers from bad days sometimes.

But the 29-year-old pop superstar insists that she does not dwell on her issues, instead using them as a motivator to work harder.

In a new interview with the August/September issue of Complex magazine, the Single Ladies singer reveals how she deals with tough times.

"Whenever I feel bad, I use that feeling to motivate me to work harder," she explained.

"I only allow myself one day to feel sorry for myself.

"People who complain really get on my nerves. When I'm not feeling my best I ask myself, What are you gonna do about it?' I use the negativity to fuel the transformation into a better me."

The star also describes what she would like her legacy to be and how she would prefer to be remembered.

"I just want my legacy to be great music," she said. "Someone who was a risk taker and someone who had songs that struck conversation and emotion." (C) Cover Media