it definitely sounds like u could be suffering from something here, although whether or not it is ADHD is really up to a professional to diagnose. Are you getting enough sleep? Eating ok? Exercising? All of those can play a role in level of focus and the ability to pay attention. I'm not saying that you don't have anything, I'm just giving you some things to consider.

As the above poster said, you should try and see if there is a learning specialist or a counselor at your school who could advocate for you. Just because you don't have bad grades doesn't mean that you don't have anything going on. I know personally, I sailed through school and got good grades without even trying. I found ways to get around my procrastination and my lack of motivation. So its definitely possible to get by with ADHD and not have it show up on a report card.