>Though, my problem here is putting them in my ears feels like going under water and I hear everything that touches the cable or my chewing and breathing very loud.

This is pretty much how it is supposed to feel like. It is a side effect of the isolation from external noise you get from IEMs plugging your ears. I got used to it pretty quickly but obviously different people have different tolerances.

>On another note: my ears also screemed in pain from active noise cancelling and I cannot find anyone else who experienced this. Maybe my ears are strange.

Yeah I'm very sensitive to the active noise cancellation hiss as well.