Parents are mentally abusive

Soon, I'll be going to OSUT. My parents think I'll be going NG, but in reality, I'm going AD. They don't want me to join at all. So much so that they make fun of me for it. They are so unsupportive and flat-out mean. Anyway, where can you keep your personal belongings when you have to go through OSUT. I can't keep them with my parents because they're disowning and very rude to the point I wanna leave and never come back. They have completely left me out and talk badly about me. I did nothing. Seriously, I got a 4.0 GPA, I did dual enrollment and got 4.5 GPA, I watched my toddler sister for 3 years, and they stopped paying me, I clean the house, I do most of the grocery shopping, I've never snuck out, dated anybody because that was their rules, smoked, drugs, cussed, nothing and where does it end. I've tried pleasing them with everything, and they call me a wanna-be. I have no one who can keep my things. Any advice on where to keep personal belongings, or is there a place for this? I'm constantly being talked down on and feel so worthless. Does anybody relate? Pls message me if you do, I need help.

Edit: A lot of people are telling me to leave my parents, which is very understandable. It's just hard bc my sister is only 3, and I would have to leave her too. She would probably never understand. She's never been treated like I am. She's the favorite. I could care less if she was or wasn't, but why can't you treat me the same?