Could you have ADHD if you can't concentrate and focus and you frequently space out and get off track and hate reading directions?

Extreme difficulty with sustained mental effort, focus, and staying on task is one of the hallmarks of ADD/ADHD. That said, I'd say it's likey that you have ADD/ADHD, but only a neurologist can diagnose you. I would highly recommend that you get tested. There are many of effective treatments available.