I'm 20 years old. I have habit of extreme over thinking. I get thoughts constantly that I will hurt somebody unconsciously. Then I have constant habit of checking something as many times as possible and capturing photos for assurance. I want complete assurance of everything every time. If I couldn't get assurance at time, I feel anxious and heavy head. I get unstoppable and negative thoughts running through my head makes my head heavy. I couldn't focus on something for more time and my concentration breaks very easily. I couldn't control my thoughts. I can't study because of it. I constantly think what people think of me. I need assurance every time. And sometime I know I didn't do any mistake but yet I need assurance that I didn't did it. I take photos and screenshot on my phone for assurance. I have 1000 of useless photos store for assurance and know they are useless but I can't do anything in this. I am always in depression every time. please anyone help me I'm in serious trouble.