depression?

Sarah
So for a couple of months I've been feeling really sad, and hopeless. I looked up on the things i felt, and sure enough it lead me to the conclusion of depression. (Hopelessness, being suicidal, change in appetite/weight, alternating in weeks w. Over- and undersleeping, bad memory, self hatred, poor focus, low energy, and a hard time doing/ remembering daily/simple tasks)
I've been very honest with my mother lately, and tell her everything i feel. But I haven't told her, about my suspicion that it might be depression.
I, myself have no real factual or medical knowledge about depression, and i would hate to sound like those selfish kids that self diagnose, and overreact, on themselves just being sad.
maybe that's just what I am?
I don't even know if getting medical attention will help, or if i just should wait it out (if that's even possible)
How should i tell my mom?
Should i tell my mom?
Xx