Being hailed as “the female Ed Sheeran” aged just seventeen is not something your average A-Level student would be able to claim. But, then again, Katie Kittermaster is no ordinary teenager. Katie Kittermaster has barely finished with her A Levels, but is already performing in front of crowds of hundreds of thousands and her steep trajectory shows no signs of leveling out any time soon. Having written many of her songs at the tender age of just fifteen, Kittermaster went…