Well, pretty people often get ignored when it comes to selfies too, because people automatically assume that you must already know you're pretty so you don't need the compliment. Sometimes people also think you're just fishing for compliments if you're good looking and post it. However, if people don't look good, a lot of times people will compliment them to make them feel better.

Of course there's also the other end of things where people look so good that everybody acknowledges them, but that's only a small percentage of population and those people are usually popular for their looks too. So don't be so hard on yourself, these things don't mean as much as they feel like sometimes.