Burning+discomfort DEFINITELY warrant a visit. Call the planned parenthood in your neighborhood if you do not have an OB-GYN.

With respect to preferences... it is probably subtle. A fine line between:

-- having some disgust when you think of vaginas of OTHER women as a by-product of your being straight (which would fall under your category of "preferences" and no, as such, would not be a big deal - you are right), AND,

-- being disgusted by a part of your own body, which is a very big deal because it is YOU - you are disgusted by a part of you, and that always is a big problem.