You might need to look other secondary factors..

1. Are you sleeping enough? It seems you are sufferring from depression. About 1 in every 10 person suffer from depression in USA. YOu should look for some help.. Talk to close friends.. people do understand.. it is a disease.. there is nothing wrong getting ill.

2. Dont smoke or drink. It does not help at all.

3.Sometimes... mineral deficiency in our body/brain makes us feel 'blue', sad, out of concentration.. I used to get so tired and just sleepy sometimes in past.. I started taking quality multivitamins.. and it all went away. I got concentration on study.. and full of energy.

4. Play something.. football, basketball, running whatever.. Express your distress/anger on these activites.. YOu will feel better.

LIFE IS BEAUTIFUL.. LIVE IT. 

DONT WORRY, what others say.. YOU HAVE THE BRIGHT FUTURE..

,,,.. and this video is FOR YOU.