Agnes, I think I know what you mean. I'm not shy at all normally-- I'm the first person to introduce myself when I'm in a room full of people I don't know-- but the first time I met someone I knew online, I felt horribly nervous about going up and saying, "Hi, I'm that kid named Schmerg_The_Impaler." And I turn into a blibbering wreck around celebrities.
In my pants, she has burst like the music of angels, the light of the sun! --Marius Pantsmercy