Rocker Shirley Manson, frontwoman of Garbage, has revealed that she struggles with self-doubt as much as the next person and believes that faltering a little now and again is simply "part of the human condition".

She sat down for an interview with Billboard magazine and confessed that she occasionally struggles with dark thoughts, but she thinks it's very ordinary to experience highs and lows:

"I'll feel really grateful for the success I've enjoyed, but then, at some point in the month, a dark Shirley returns -- and her voice gets really loud. I'll feel like a f­--ing idiot because I don't have goals. I have self-doubt and ­frustrations and disappointments. I think it's part of the human condition. Even someone like Beyoncé doesn't f--ing believe in herself 24/7!"

Manson went onto talk about her past, adding that her upbringing was hard and her mother seemed to favour her other two sisters: "My mom was always the hardest on me because I looked the most like her. She would tell my two sisters they were beautiful, but tell me I had a great personality. I just thought I was an ugly bastard."

She also spoke about a traumatising sexual experience that took place when she was 13:

"A boy fingered me, then grabbed a knife and told me he was going to stick it up my vagina. I was 13 years old. It frightened the shit out of me." 

"I think that's where it all began to unravel. I just had this realisation: Why am I distrustful all the time? It's probably because of that. I spent so long ­disgusted about myself. I would sob in the ­bathroom, because I thought I was failing."

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Watch Garbage's video for 'Empty' here: