What do i ven do now?

ot going to bore you on with every detail of my spiiraling depression. To put it easily I have had major/severe depression for 5 years ( I'm 16) and for awhile now its been spiraling out of control. With way. To hurt myself (cutting, tugging hair, digging my fingers into my body, biting myself). With eachecond of the day contemplating suicide, recently made a failed attempt. My family is very opinionated, and therefor only going to mild depression do not understand me. And I know I can't expect them too. My family is dsyfuntional, I have no friends, poor education ( due mostly to my migraines. Yes I do see a doctor and take medication) I have to live with so many bottled up feeling, and secretsits all starting to eat me alive ( night terrors, can't keep calm, feel as if someones watching me, sounds that aren't there, and not falling asleep until late and sleeping most of the day away) I also do not want to get out of the bed in the morning, getdresses, take a shower, don't even want to simply comb my hair. The only thing I live to see is my cat Smokey who I've had for 12 years.As I do try to explain myself to my relatives, they do not understand.My severity of my problems. It was my therapist who got through to my mom saying that a hospital might help me. I said I will hold out till Monday for another doctors appointment. Please understand, I have been through several therapists/ counselors that also specialize in adolescents. I believe I found the hospital of my choice, which I'm thinkingof announcing my choice to go Monday. I suffered through no friends, dysfunctional family, migraines (since I was a toddler), a period of an eating disorder, and have self image problems. Okay so my question here is how do I bring it up? How do I tell them this is the best option for me? Also, what is a mental care unit like? Al