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Taking a look at yourself is the issue. Self-introspection ought to include some variant of the question "Am I having enough fun". In answering this question, people take an empirical approach, looking at other results.

If what you see of other is biased, that biases your answer to that question, and thus biases your introspection towards "I should be doing better".

I feel the same way -- I enjoy seeing my friends having a good time. More pragmatically, I'll frequently (like, just yesterday) see someone's vacation photos and think, "hey, that looks like fun! Maybe I should plan a trip there myself."

It's about seeing people you don't like that much having fun. Of course the next question is why do you go see their profile?