I m depressed or not?

I feel very lonely some times.

After class 8th i live in this loneliness. I don't know what i geel is depression or something else.

After 8th i start to incomplete my duty as a student.

I barely pass my 9th to 12th.

After 12th i waste my 8 yrs in trying to creak competitive exams but not fully. I not able to creak it.

In those 8 yrs i start yo become lazy. I like to remain alone . I don't want to bothered by anything. I like sleeping . I sleep 3 or more days without eating.

After 8th yr i changed my line. I want to do beat in that . But i still feel something is wrong with me . I can't able to concentrate. Some times i feel i m not worthy of anything that i have. That many chances, efforts of eveyone who is related to me. My family Fight for me. I feel like an asshole.

Plz can anyone how i can cure myself so i can do my best now.