What are symptoms of depression and do I have it?

1)What are some signs or symptoms of depression? 2)And do you think I AM depressed?

1. I have looked on the net but I cannot find anything that is not in “doctorial language”, and I need to know because I think I have some of the sypmtoms od deppression,, but I juts don’t know.

2. I don’t want to tell my parents about this, well I acctually live with my grandparents cause my dad left when I was 3 and got re-married, and my mother have some problems.

Well, anyways… I feel sad 90% of the time, I have major mood swings from happy, to extreamly mad, to violent, than sad. Most of the time I feel as if I am worthless, and I HATE my life, I feel like I can’t trust anyone, I am also a cutter, I am losing interest in everything I like example: friends, family, going out places. I like it when im by myself but than I scare myself (by thinking about suicide {I dont want to die or anything} but thats how I feel), and all of these things have started happening within the last 2 months. My friends say that I have a “hormone imbalance” ( which I definitly do not, I was just recently at the doctors and he said I am fine), or they will say well just stop cutting yourself, or you’ll get over it its just a phase.

Do you think I am depressed? And what do you think I should do about this?