I went through the same problem with LinkedIn some years back. I'd start making connections with high school/university/'social circle' chums who were 'already' working at Microsoft and Deloitte and IBM and the New York Times and thinking I was worthless for 'still' being in school.
I've had the pleasure of touching base with some of these folks as they've come back into town over the years and it was so striking to hear some of their frustrations about their careers, and how they were feeling unaccomplished compared to some of their peers and forebears. Moral of the story: perceptions are not reality, and the perception that you are worthless will only hurt your productivity because you will feel that investing time into bettering yourself is not worth it. It's not a race.
I can't be a judge of how smart you are, but being hard-working is a choice you can make. Blocking HN is a good start.
- Kurt von Hammerstein-Equord