They've seen a black girl at least once before in CR *coughs*
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When you're a pretty chick people will stare...even if you're dressed down.
If i'm alone i'll go out and out looking like i'm about to go on a job interview
haha (giant knockers still catch eyes even dressed super conservatively).
The uneasiness might be just because it's somewhere new. I still get it sometimes even now and i'm super seasoned in touring lol (esp Iowa). While the brown and black population combined is maybe 10% (I google stuff like that before I tour somewhere lol) I still found most of the people i encountered to be super friendly. I don't think you're overreacting tho.