Stop reading them. Seriously, they are damaging your world view - ESPECIALLY HACKER NEWS. If you can't read these things with a critical eye, you will end up in a death spiral where you feel constantly inadaquate. I speak from some personal experience here...
Turn off the computer and go outside. Go for a walk. Go for a run. Go to a local tech meetup. Meet other people. Talk to other people. THIS is where you will learn how to do what you want to do.
You will not change the world with a web app. No one changes the world with a web app. Or an android app. Or an iPhone app.
The world is vast and has many places that need smart people. Find those places, adapt to what they need and start solving problems in the way you can - not by what you think the tech world would do.
Start small, think long term. Build something every day (even if it's trivial). Think of life as a long hike. Each moment feels short, meaningless, but after a while you will turn around and look back at how far you have gone and will be absolutely astonished.