Adults who have child-like singing voices?

I am a 17 year old girl and I have a very child like voice. I hate it, because I am in a female fronted grunge band and I have to sing back up vocals, and it doesn't fit the genre. I wish I had a voice like courtney love. Does anyone know any adult musicians whose voices are childlike? The only one I can think of is kimya dawson from the moldy peaches. Strangely, my voice is a lot like hers.