The 48-year-old singer – who famously declared she had never been kissed when she auditioned for UK TV show 'Britain's Got Talent' last year – has enjoyed a hugely successful year, with her album 'I Dreamed A Dream' being a smash on both sides of the Atlantic, but she wants someone to share her happiness with.
Her brother Gerry Boyle said: "Susan has the world at her feet in terms of fame and money but at this precise moment in time it means nothing. Absolutely nothing. The one thing she wants above all everything else is love. Who doesn't?
"Her biggest wish is to find someone who she can share her success with and support her through the difficult times. Of course her family will always be there for her but it is not the same as having someone special in your life."
However, Susan – whose erratic behaviour has been a cause of concern for her family, friends and management – is terrified she will never get a man because they are put off by her frumpy appearance.
Gerry added to the Mail Online website: "When she can't sleep she rings me or plays things over and over in her head until they almost crush her. I try and lift her out of this negative mind-set but it is so hard. When she hasn't got anyone special to lean on, things begin to go wrong for her.
"Susan has this impression that everybody thinks she is some kind of freak because of her appearance on stage and this is what puts men off. Of course her money and fame would intimidate most men and I know the jokes about Susan being nicknamed the 'Hairy Angel' hurt her enormously."
It was recently revealed the one constant companion in Susan's life – her beloved pet cat Pebbles – had moved out of the Scottish home they shared and is now living in London with a new owner.