One thing to keep in mind is you should not compare yourself to what Mark Zuckerberg is right now. You're at the beginning of a path and he is much further along. When you boil down Facebook to what it was originally when he shipped it was a rather good idea, written as a crud app in php, and looked like this:

https://media.licdn.com/mpr/mpr/shrinknp_800_800/AAEAAQAAAAA...

Ship, learn, iterate.