first off no you aren't shallow, that's your personal choice to be attracted to that type of person
it's really a double edged sword, on one hand since you are like skinny big breasted women, you get labeled as shallow.
however if you said "omg the skinnny chick is awful and i like fat chicks" you wouldn't be shallow cause you only like "fat chicks"
the funny part is both sides are shallow, it's just politically correct to not care about looks, tho really it's a one sided thing. it's bad to like only skinny, big breasted women, even tho there's a good genetic reason for liking said features in a woman.
it's a rather funny conundrum but the thing is you will always like what you like, no matter what
i mean there's certain things i always like in a woman, however i won't date someone i don't find attractive, that's not being shallow it's just part of the relationship. they don't have to totally fit the mold of what i desire in a woman but the more things i like the better