Sounds like me as a kid and adult. And for me, it was also procrastination (side effect of the perfectionism), slower to get things done and trouble with multi tasking. I was quiet, smart and got good enough grades. I most likely wasn't working to my full potential. I do ok now as an adult but there was definitely a struggle to get to this point. I had no idea I could be ADHD/ADD until a friend who has it pointed it out to me and it all makes sense now. I have never been formally diagnosed but am thinking about getting it done.