Can missing school due to extreme depression be excused?

I know this sounds crazy, but I am going through so much right now. I know that some people feel that school is a good place to escape all of my problems but the real problem is school itself. Just the thought of it fills me with so much dread and anxiety that I cant go back until i'm "better." I feel that if I don't take care of my depression, anxiety, social anxiety, and other possible disorders that I don't even know about that i will never be normal and okay. I just want to be okay!

I know this sounds irrational to some people but I can't help it. I am not mentally ready for this. This is my fourth year of high school, I am supposed to be graduating but I failed classes because I have a fear of school and the stress it brings me. I'm only 17 and my parents are forcing me to go to school, I know they mean well but it scares the crap out of me when I'm there. Anyway, im not talking about months, just maybe a week so that I can see a therapist, be prescribed something or so before I fail classes again. I won't be able to take disappointing myself and my parents again.

I feel that I am in a time in my life where I need help right NOW and I am much more worried about my well being then school. (I am pretty smart so I wont be missing anything really)

Do you think this is possible or am I just crazy? Do you think the school would understand that I am going through some extremely tough times and excuse my absences? I know i have to go to school. I do not want to avoid it forever, I want to be normal. I want to be able to go to school like everyone else, or how will I go to college or maintain a good job? (Anxiety, I know lol)

Sorry for the weird rant. I cant help myself anymore, but thank you for reading it in advance. :)

I'm 18, studying high school too(although its called differently in the country I live in),and I'm in the same situation like you for years. Maybe you should think about why you're scared of school..because of some teacher, subject or some people you dont like? Maybe it would be possible to skip some specific subject you dont like or..whatever. The week or so that lies before you'll meet a therapist..School scares the crap out of me too, I hate it but...its not forever. And you aint doing it for someone else, but for yourself, your own success. Screw depression, it cant stop you.