I simply don't get the premises of this thread...
Would someone REALLY consider changing a part of him/herself, appearance-wise or personality-wise, when there's nothing wrong with it, just to accommodate his/her view of how other people perceive him/her? I don't understand....

OK, you might get a few more stares or 'piropos', specially from the Moroccans and Latinamericans (that's so true!*) than a brunette, but I don't think at the end of the day that makes a significant...ANYTHING, in one's life, you're not going to be attacked, harrassed, etc...just for being a 'rubia', so, take it easy and if you're happy with your colouring, girl, by all means don't change it!

*Luckily, these tend to be admiring stares and respectful compliments, unlike the ones one sometimes gets from certain Spaniards.... :o