How or when can I get out of my CHINS warrant?

I started dating someone that was three years older than me when I was still considered a minor, and it was going fine.. until my parents found out. *I'm not a minor anymore.They didn't want me with him, so they started telling me to stay home and criticizing me by calling me a hoe and such, just to put me down and make me obey them, it's complicated. Before they found out, I did go out often but not to parties or anything, and when I get a boyfriend, they started to notice me. I'm the "quiet" middle child. So they start getting SUPER strict on me, and being the stubborn person I am, I disobeyed because I don't think it's fair. You're probably going to think I should just break it off, but it's just that we've been together for a long time and it's just not worth breaking up. You can call this the price of love, haha. Put all that "you're still young" crap to the side and yeah. Long story short, I get hit from time to time for no good reasons, then I get kicked out and they tell the police I ran away. The officer didn't let me speak and just picked sides and told me I was going to be put on a CHINS warrant, so now I am. I know for a fact it's for all the wrong reasons, I've done my share of research and I don't meet the requirements. I also don't wanna get emancipated or "snitch" because I know DSS will get involved and I have a little sister that i care about, and I don't want her to be taken away too just because of me. My probation officer is my fathers friend, so everything he does wrong doesn't get him into any trouble. I know all I can do is wait, but for how long? My question is, when and how can I get out of it? When I turn 18, am I automatically out? Help please!