I'm being abused.

I've been a victim of verbal, emotional, and mental abuse for over a year now. He's rude and belittles me and mocks me constantly. I'm not allowed to have male friends and he cussed me out and left for a day because I accidentally accepted a males friend request on social media forgetting I'm not "allowed" to. I'm interrogated constantly, I can't be in cars with boys, I can't wear shorts in public, he doesn't let me express my anger without flipping it around on me and says that it's my fault he's like this because I'm "too flighty" and "flirty". If I talk to my friends about it he gets upset and says I'm trying to turn people against him and make them think he's a terrible person. I'm too scared to leave him because he says awful things and calls me a whore and tells me to kill myself or "have fun with my fuckboys". 
I know he's abusive, I know this is wrong. I want to talk about it and I want to understand why I'm like this but I'm scared he'll find out I told someone about him. I feel like my friends are annoyed because I never tell them the full story of how he is and they don't know why I don't just leave him. I need help. I'm sixteen years old and the abuse keeps getting worse.