Don’t be too hard on yourself, Claire.
It often depends on what you read.
If you take in a steady diet of posts from places like MOZ, Kissmetrics, the Search Engine Journal, ahrefs, etc, then you can find yourself believing that if you don’t have a degree in Google Analytics that you’re somehow deficient in the IM space.
For those people and many others like them, metrics are their lifeblood.
Most of us don’t need to have that degree of detail in that sort of thing.