Another one with a brain just like yours. I too thought everybody's brain was like this and I was just somehow incompetent in my inability to shut out the 'noise'...until I was diagnosed with ADHD last year...
For the first time ever that I can remember in my 47 years of life, my brain was quiet the very first day I took my ADHD medication...
It was very eerie, almost echoey, and rather strange, and I really wasn't sure I liked it at first, but as I've got used to it it makes focusing on one thought/conversation at a time to its conclusion possible, which really helps to make life less frustrating
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I'm now more used to my medication and the inner monologue is still there, but it runs a little quieter, and less insistently these days! I am able to 'switch it off' and focus on the task at hand, which is great. My house is tidy, I am calmer and can maintain my focus and attention even on boring, mundane tasks whilst medicated, and I am still me
!
ADHD is very heritable (believed to be up to 70%+), so if one or more of your children are diagnosed it is likely you or their father also has ADHD. DD2 and DS were both diagnosed before I was, then DD1, and having learnt more about it I'm pretty sure my DDad also has ADHD!