It's not up to you to decide if you are good or not. If you like coding, just keep doing it. You will struggle at some things, be better at others, be a total

It's not up to you to decide if you are good or not. If you like coding, just keep doing it. You will struggle at some things, be better at others, be a total ignorant in others. That's fine, it's part of any complex job. You can decide to expand your area of knowledge too. You feel you don't know basic OOP concepts then work on that.