Is it normal that i miss the most important part?

And that I do this so often? I think everyone I know has accused me of not listening to them. And it is true. Some of my most used words are what?, huh? and hmm? I'm always drowned in my thoughts it seems... I often miss what people say or don't hear them until moments after they've spoken. And by then it's too late. they think i'm crazy. or selfish. But the truth is I'd really love to hear what they are saying. And the worst part is that I miss the most important part of EVERYTHING. Someone could be telling me something i've wanted to know for years and my thoughts will wander before i can catch myself. someone may have done me wrong and i'll subconsciously ignore the deadest giveaway. When I got my tattoo a strange man in a wheelchair had a beer in hand and rolled over to ask me what I needed - I didn't notice and I got my tattoo anyway(looks good though). I noticed in class, we have to watch movies and answer questions as it plays, my mind usually wanders at the point in the movie where the questions are answered. What is wrong with me? I could have figured so many things out sooner if only I could pay attention... to important things... I'm fine with trivial matters