I'm not sure if I can explain this so that it makes sense, but here goes...

Sometimes I can 'hear' myself thinking in the voice of one of my male friends.  Not him in my head, it's my thoughts and everything, but instead of it being in my voice it's his.  The only logical reason I can think would be that he's the person that I've known the longest who's my age and male, and he's pretty similar to me in terms looks and personality, so I'm transposing a voice that is more comfortable in terms of who I am mentally onto my thoughts rather than just having the voice that my body produces.  Either that or I'm screwed in the head (I don't understand how thinking works for other people, I thought it was unnatural to think in words when I was a kid and never really worked the concept of thinking out since.)

Is that possible/does anyone else find that?

Yes it's possible to think in another voice. I think in a way more deep voice than what I have right now (would be creepy and awesome if that is the voice I'm going to get) so when I speak to people it's doesn't sound like my voice. It sounds like somebody else when I speak. Therefore I tend not to speak so much. I'm less likely to speak if I haven't spoken in some time.

i agree with Sparrow. When i think, its not my voice either lol i have a deep gravelly voice and i sound cool. But, then of course when i talk to people thats not the voice that comes out and i shock myself. Or sometimes i think in a celebrities voice (anyone else? lol) always the ones who have deep awesome hot sounding voices, i know its not mine but, i kind of convince myself it is and again i talk and its high pitched and stereotypically gay sounding. Its actually sort of depressing lol

some people tend to have have problems with the thinking voice.  I know I do xD but thats because I need to master a little bit of my voice to train my mind to hear something new.  Its bipolar these days.

Thanks, I just thought I might of being going a little bit crazy.  I know what you all mean about shocking yourself with how you sound in real life, my voice isn't too bad most of the time but when I'm talking to people at work it's so high pitched it's awful.  Even people who know me as female laugh at me when they can hear me at work, but no matter how hard I try the nerves always get to me there and it comes out nasty and squeaky and high.

I do that alot of times, from many of my friends specially if I read something I usunally switch over to one guy/girl I knows voice who is reading it in my head.