Stress guilty feeling low self esteem.

I am 20 and my problem is that I feel like I can't control my sexual desire at all and that makes me so scared. If there is something virtually sexual I get turned on easily. And if I am talking to any girl virtually I think and imagine about sex stuff. This all happens virtually only I never felt this way in real life but I am scared that this will happen in real life. This all makes me stressed and I avoid talking to girls online and sometimes in real. Most of the time I feel normal but when I get into that phase it's very hard to control me. I watch porn a lot and masturbate and I know this is the reason for my problem but I can't even control this I also feel low confidence and concentration and social anxiety and doubts. I know it's time to focus on my real goal and I am doing that but this things and negative coming against my wheel and I am losing my discipline. What should I do to overcome this also I can't sleep on time so please tell me on counter sleep med non-addictive .