Why does your girlfriend disregard my feelings but wants you to respect hers?

From the sounds of it, she's just a little selfish and conceited.

Talk to her about this (not but calling her selfish or anything, but let her know that it feels like she doesn't care about you).

If she won't listen, she might not care for you the way you care about her. Listening and caring is a big part of a relationship, and needs to work with both partners.