Feeling lost. Be harmful for my family.

I have lost interest in activities i used to enjoy earlier, i feel lost all the time, i don't feel like going anywhere or talk to anyone. I feel tired nd sleepy whole day, i can't focus on my studies, i feel disappointed but not able to do anything about it. I am always having negative thoughts about everything, whenever i try to do something suddenly I'll start thinking that i wont be able to do it i m just wasting my time and because of these negative thoughts i am not able to be productive. Sometimes i feel like what I am even doing with this life. I even have a problem of repeatedly checking things like doors, electric appliances,stove just to get a temporary relief from the thoughts that if i don't do this it ll be harmful for my family.