Q&A: I have all the symptoms of depression...?

Question by <3: I have all the symptoms of depression...?
I'm a teen girl and for the past few months I've been depressed but haven't told my parents till a while ago. I have all the symptoms of depression and most of manic - which I don't know what that is - but I think I really really need help and my parents think it's just a stage I'll get over. What do I do? I've also been self harming because it's my way of letting things out without bothering other people. Only a couple of my

depression and anxiety scale