I did above average in school (A's and B's), but I wonder how well I might have done if I had been able to focus.

Yeah, I was really extreme. It was so hard for me to sit still that it almost felt like something was tickling me inside of my brain. It is a sensation that I can never quite explain to people. I would get a super strong feeling of aversion any time I attempted to pay attention to a subject that I had no interest in. At first I started to get Cs and Ds, but eventually got Fs. After that, I would just sit there and not do the assignment at all, or fill out random crap or draw pictures on the paper. It was awful.

One year I decided that I was sick of it, and I was determined to get an A in one of my classes. I remember I put every ounce of energy into following what the teacher was saying and wrote down everything that I could. For the first couple of weeks I got A+ or close on nearly every quiz. I was so amazed and proud of myself. Then one day I came in, and the teacher said "Ok, now we're going to move on learn some new concepts." I was totally ready, at least I thought. Halfway through the class I was completely lost after realizing that I had been zoning out. Now it was too late, and I was super far behind. Then I rolled downhill like a barrel from there.

My mind is in so many places at once most of the time. My wife will often ask me how I got talking about something in particular.

Oh yes. I have gotten a 'little' better at this as I've gotten older, but it has only been with a lot of work noticing that other people can't read my mind and know how I segued from one subject to a seemingly unrelated one in about 5 seconds. The connection seems totally logical to you, but they don't see how you got there!