Question About A.D.H.D?

im a 16 year old boy and a few years back i was diagnosed with A.D.H.D. I Know what it is .. but i dont understand the full cause. Ive been told its because my dopamine isnt working properly.. which is the natural thing in our brain that causes us to feel good blah blah. so does this mean .. people feel better then i do when something good happens and what can i do to help it. Does Amphetamine , Ritalen etc. help me get more pleasure out of things that please me?