Yeah, same here.
I'm pretty articulate when I write, and can *almost* express my feelings (though I'm not really all that successful with my NT friends).
If I try to talk about my feelings, however, I drop into a meltdown almost immediately. It's like there's a big switch in my head that's labeled "emotion ON/OFF" - I can flip it when I'm alone and, while I may be racked with anger or sadness, it's private and I can continue to write rationally. If I'm with another person, though, I loose everything and turn into a complete mess.
There were plenty of times in the past where I tried to communicate openly with friends - the results were pretty hideous, even with the few who I still remain friends with. I was in my thirties before I realized that "talking about it" didn't actually help, perhaps because the people I was talking to couldn't really grasp at a fundamental level why the things that bothered me were a problem in the first place. Trying to explain how hard it is to cope in a social situation, how utterly exhausting, to a friend who has never felt or experienced the immense effort required for someone with AS to operate under that pressure (and keeping in mind that at the time I had no idea that this was not *normal*, that others didn't have the same difficulty) is bloody useless.
I used to be terrible with people I didn't know well - I'd babble endlessly about things that, in retrospect, I know they weren't interested in. Nowadays, I just say nothing. I find I have an even harder time around women, though that's certainly a result of the added interrelationship tension (is she single, does she like me, what should I say... Gah!). My mind goes completely blank.
But, I can always write. Funny how that seems to be so common here...
Nick