I am very self conscious of my voice and I am jealous of girls with those soft, soprano or whimsical voices. I think I intimidate people, especially guys, with my voice. Do I need to speak up, fake a British accent, or actually get surgery?

No!!!! You could be An Alto.  Altos are belters.  Get a singing coach or teacher or go to classes or choir.  Find a genre of music that would suit your voice.  It might be that you might have a good Rock Chick voice; o can do a awesome Janus Joplin cover or something.  Your voice is yours and don't feel bad because you aren't a soprano.  Altos or other voices have to be better as they have harmonise with the sopranos who just sing the tune in the choir.  

You find that your voice is powerful or just sing out to all the songs you like and if you sing songs done by males then why not.  Altos are good as they can sing out really well and you can always work on your higher range.  Altos are belters they can really go for it.  So just sing....who knows people might be jealous of you.