Depression. Health is really not well.

Addiction, Career, Dreams and Love Life. I've been through a severe depression. As i was just a pass out from my matriculation I was very depressed to see myself in the new weird world where taking admissions was not as i thought. I was being so lazy about that lead me to a confused life living still and addicted to smoke just to release stress it has been a habit now. I want help about so many kinds of problems in my life. I don't even have a girlfriend because I and scared from so many things. I have become a coward for no reason. I fear dealing with so many things. I just want to live a stressful life. I don't want my life to be the same as it is going. I've a lot to achieve. There's a deep feeling of helplessness. As if it's not in my control i can't sleep if i don't release my stress. I need to get out of my feelings and all that make me stressed. Please help me in this situation I'm physically fit but my mental health is really not well.