Hey, nothing wrong with the voice you were born with, or singing what you've heard from another singer, or, nowadays, from recordings which have moved you in some way, the way folksongs have always been passed on. You can hold infuse your interpretation with respect for your source or informant without impersonating him/her. The job of an artist is to touch the listener's senses and emotions as nothing else can. This applies whether it's a song for work, fun, love, discontent, awareness or any other function. It should be clear, unambiguous and, preferably, singable by others. It helps to believe or find truth in what you're singing. True, some vocal qualities sell, and innate talent can be nurtured, but why enter a 'rough' 'rustic' 'inferior' 'working class' artform in the first place if not to be part of the unique sounds and feelings of authentic, home-made music free of pretension, manipulation and profit-driven choices?