I’m in a really tough situation, I need Help.

So...I don’t think my dad is considered abusive. But he constantly puts me and my little brother down, telling us we are worthless and stupid. He also doesn’t allow either of us to leave the house. It’s caused me to develop depression and I’ve cut myself in the past, and a little recently. My mother isn’t in the picture, so it’s just me and my brother. Recently, my little brother told me he wants to get help but I think it will only make things worse. My little brother told me he wants to kill himself, but if I tell my dad he will only get mad, like he did to me when I told him the same thing years ago. I don’t know what to do...