[sidibe]

Yup, this is a symptom of having too high expectations for yourself.

The skill needed to contribute on a mature codebase within the first year is being able to tune out anything that doesn't directly interface with small changes you are making, and trust that someone more experienced will notice during reviews if it accidentally does break something outside of that scope. And do that again and again. Ambition is a bad thing when starting on a mature codebase, do new stuff on the side if that isn't satisfying.