Do I Have Depression ?

Recently ive been really stressed about my current relationship with my parents, friends, boyfriend, and school ecspecially. I currently look to smoking as a solution/ stress reliever. I used to self harm, but have finally looked at the outlook it had on myself and my family so i stopped. I always feel down and think low about myself, I dont have many real friends anymore. My relationship with my family isnt how it used to be, I feel like i cant tell them anything anymore, without them yelling and only seeing the negitives in all situations. I have gotton to the point where i dont want to be around them anymore because it just leads to more arguments. I just hate feeling down all the time, do you think these are some possibilitys of developing depression ? or do I have it? :/