BonafideI have 'ADD' and used to have a lot of trouble focusing on stuff and eventually started using ritalin, worst decision I ever made regarding this subject. You are really not yourself anymore, you turn into a numbed down version of yourself who can just sit there and read without any creative thoughts. Just saying if you want to accomplish something, using drugs is just going to make it harder for you to do your job in the future without them.
ritalin is not a drug for people with ADHD and shouldn't be used to treat people with 'just' ADD, seeing as how you describe your experience with it