How Often Does Everyone Shampoo Their Hair?

[DepressedByHairLoss]

I've heard that it may not be good to shampoo your hair every day. However, I go to the gym a lot and if I don't shampoo after a workout, then my scalp gets all dirty and itchy. And then before I go out, I shampoo quite a bit with a hair thickening shampoo which makes my hair look better.