A. D. D. vs. Depression. What was that?

I was a brilliant student till 9th standard , when my father used to teach me but as i went to other city in 10th standard ,i suddenly became boring or distracted from my study , my tutor used to teach me that tym but i used to be in other thoughts (not any specific thoughts ) , i found my self not present at his class , then i just got 80% in 10th , then 11th it became worse and started feeling unwilling to study , cant sit for long in a class , became tired,fatigue, excessive masturbating & in 11 th and 12 th i got only 60% from cheating and some study , i felt less intelligent student got higher marks than me I dont know what was that ? Depression or A.D.D. but i was not hyperactive I used to day dream a lot , my attendance used to be only 40% In my b.tech i got 50% ( the symptoms became worse as i started smoking ) Some of u will say it was puberty then depression , & some A d d Some will say comorbid of both One thing i should add that i only study in do or die situation