Is this the right approach? It's all I can think to do.?

[Schitzo]

Ok, so, my parents have never been understanding. EVER. They think i'm a attention seeker little emo kid. And when they want answers as to why i feel suicidal, they come in DEMANDING it or yelling and...well, sorry, i'm not gonna answer things that way. Momma demands. Dad yells. Elsewise, they complete ignore it. Like seriously. I went to the school counselor begging for help, and she called me mom like 6 times reporting this because she watches me around the school, and my parents never said a damn word to me other than "You need to stop. Your counselor won't leave us alone"
I'M LIKE, ARE YOU SERIOUS?!?!?!? MAYBE just MAYBE that's a SIGN you know?!
Anyways.
They don't really do much. I've cut myself for years and every now and again they search my room and take out any razor blades or whatnot. Never say a word to me about it, I just notice their gone and role with it.
I overdosed before, last year, and they would barely even sit in the hospital room with me... Momma just yelled and dad went into police officer mode when I needed my daddy. He's a cop, btw.
Anywasys...
So here, this past like 2 weeks...I've been completely suicidal. It's all I can think about. I want it, so bad, i've cut so deep I thought I was going to die... but I'm a pus. I can't get it right. I want it so bad though. I'm gonna keep trying, I know.
Because I haven't been able to sleep well, or eat well, it's taking its tole on my body. I've been home from school for two days. Dad said "You're either better tomorrow or we're taking you to the docttor." Like that's a threat >.> .... Anyways. I can't get my mom to vacate the room when i'm at a doctors office, and she changes EVERYTHING i say. Downplays it or says "NO YOU HAVENT!" and i'm like...really mom?! REALLY?!
And i know you'll say "TALK TO YOUR PArENTS" but I can't, and I have no one to actualy talk to about any of this..

So, i'm going to the doctor tomorrow about my physical illness. What I plan on doing is sending my mom out of the room (wether she likes it or not!) and telling the doctor EVERYTHING. Like suicidal and all....
I don't know if it's rihgt, but it's all I can think to do honestly. It's going to make my mom beyond upset if I get sent off and i didn't say anything to her about it, or they'll think i'm begging for attention...either one. But I can't talk to my parents! So I seriously don't know what to do about all this. It's crazy. I see no other choices...
If you do, PLEASE tell me.