> So I'd like to ask you to describe to me in detail what it should feel like

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I have several in-ears. There are those that I use with tripple flange silicon tips. I don't feel those much but they are there. The seal isn't complete so the loud breathing isn't a thing.

I've got a pair with foam tips. Those feel like wearing disposable earplugs. Total block of the outside so more breathing. Fairly smooth cable so not that much noise.

I have some bluetooth in-ears with comply tips on them. Primarily for gym usage. Middle ground between the other two. Enough blocking to filter out most of the crap they play in the gym (why I'll never understand, everyone wears headphones anyway) but not quite to get all my breathing amplified.

If I want comfort I put on my over-ear beyerdynamic. There's a reason these are popular in radio studios, they're so comfortable!!