I don't feel any shame for anything nowadays. Doubt for sure, and uncertainty, but never shame.
I was always into a few female singers in my teenage years, Melanie, Mary Hopkins, Grace Slick, Sandy Denny, Maddy Prior. Along with Hendrix, Cream and Bob Marley.
How's that for eclectic tastes?
Nowadays I have gone from heavy rock , back to 60's folk-rock and women like Katy Perry, Lady Gaga, Christina Aguilera, Pink, Natasha Beddingfield and Natalie Bassingthwaite.
There is just music really, and what you like at any given moment.
I wouldn't worry about it. Just enjoy it, and if anyone says anything, you can claim that you like them for their vocal ability, songwriting or any music theory terms you can come up with. I just say I find it interesting to try and play on guitar.
Karen.