About the identity crisis I mentioned below, it's interesting to add that, I had never had a proper ID card in my life.. I use a "permanent residency authorization" and have to deal with some crap once in a while due to not being portuguese. Yeah, I could have both nationalities and whatever, I'll do that very soon. But the point is, I never did.
And now I have real documents, my own social security number... I feel more whole, more integrated in society. It's kind of unexpected to be in a strange and exotic country and tell them my name, and have them search their computers and say "yes, you sure did have a social security number, that makes it alot easier, for you... and for me!... you will get the card in 10 days, meanwhile use this paper. Have a great day"