To me what you are going through really doesn't sound like something you should stick around for. I've been in abusive relationship that went from just yelling and lashing out and then him saying i love you i didnt mean it i'll never do it again. To him hitting me and choking me to make me stop yelling back, and it didn't get any better. I ended up pregnant with his child he hit me in the stomach when i said i was leaving. And now I have a nearly 6 year old son with a man that hasn't changed went to jail for hurting his wife, and her son. And i can't even be in the same room with him without shaking. I think you need to get out, especially before anything worse happens or you end up pregnant and then you have no way to be out completly.
And the stuff about him threating to tell your parents on you, He did that to me and he did tell my parents things that only he knew about me, and he tried to use it against me, to get them to like him. And they told him she's our daughter we will always love her no matter what.

I really think your parents may be upset with what you had done but will also be happy to know that you are safe if you break up with the guy.
Best of luck to you, if you need help you can talk to me