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1) Don't judge yourself after one month at your company, it takes time to fit in an learn the ropes

2) Don't be too hard on yourself. Your brain needs some rest. Rest as long as you need. Don't ever compare yourself to Zuck, you see a billionaire now but he was a student when he started FB, and probably as lost as you are.

3) Not much time? Focus on the essential: find a real problem to solve. Maybe a problem you have, maybe a friend's. Maybe something related to your hobby. Don't focus too much on coding, maybe you can solve problems with a simple spreadsheet for now, and build a site when you have your first customers