It's hard and it will remain hard. Sorry ;) Some things that might help:
- You will never know everything. Nobody knows everything. Everyone knows something other people don't, including you. It balances out.
- Don't worry about being better than other people, work on being better than you were before.
- Have a specific learning plan reasonably balanced between the job you currently have and what you want out of your career. Decide where you want to go broad and where you want to go deep.
- Don't learn ten things badly all at once. Learn five things well, in a row. Then do the other five if you think they're still relevant.