What is pretty? Pretty is all over the news, movies, magazines, etc, it is associated with someone that has been accepted and is loved.
We like “pretty” exactly for this same reason. We also want to be accepted and loved that is why we believe that being in close proximity or looking at, or thinking about “pretty” is the next best thing. It will somehow bring us closer to being accepted and loved.
So. no. You are not shallow, You just want to be loved like anyone else.