Same here. I think I have it as long as I can remember. At a few points in my life it was slightly "noisier" but I think it was some kind of ear infection (once confirmed) or debris. In a very quiet room I would hear it, and if I investigate online I only get very anxious. It might be related to sinus issues I also have.

But what helped me with those other issues (like itchy ears) is to listen to my doctor (no pun intended) to "forget" I have ears. Only wash the outer most part of the ear and leave it to do it's part. Wax, although unappealing, is nothing bad and is actually protective. I cleanse it with a hydrogen and olive oil spray mixture from the pharmacy every few months.