Can't you let me breathe?

I am seventeen years old.
I am closer to adulthood than childhood. I should be able to make my own decisions.
And yet I can't.
I'll be going to University in a year, I have to decide what to do with my life. I should be responsible and I should be able to manage a freaking agenda.
And yet I can't. There's someone (not gonna mention who, but it's pretty clear) that's always breathing on my neck. Someone that's always reminding me to do things that I KNOW I should be doing. Someone who tries to control my life because they think I'm not able to. But if they fucking gave me a chance! It's no surprise that I can't be responsible. No one gives me the chance. They just assume I can't.
Someone is always there telling me what to do and I have no. space. to think, to make my own decisions. And it's so tiring.
It's like trying to move but being stuck in a box. You can't breathe, and you just want to stand up and start running but YOU. CAN'T.
It feels awful. I've always had this thing, when I couldn't move I'd hyper-ventilate. Like, if I was at the beach, in the water, and someone grabbed me from behind or something and put their arms around me, and I couldn't move, I'd hyperventilate. I'd start to get anxious and stuff. Nothing serious, of course, but it was still stressing. I usually say I'm 'claustrophoic', even though I don't think I actually am and I don't want to disrepect in any way those who really suffer from that, but I think it's the word that best fits me.
Having walls around me, not being able to move.. it's what terrifies me the most. Even when I was little, my greatest fear was being stuck in an elevator, because I had no possibility to get out.
I was stuck.
So yeah. I just wish, hope, pray, WANT more space. for me, for my thoughts, to fucking get a grip on my life and decide for myself. I want to grow up, and be responsible, and independent.
Will I be able to do that?