So as I've been sitting and feeling sorry for myself lately, blaming myself for not preventing whatever lead to my mTBI, a thought suddenly occured to me.

Isn't it considered common to receive at least an mTBI once, during one's lifetime? I mean wouldn't it actually be quite unlikely not to hit your head at all throughout an entire life? I'm just wondering if the vast majority of the world population hasn't experienced a mild concussion one way or another?

Another concern I've had lately, is if a mild concussion can cause a personality disorder to develop?