how do i go about telling my family?

I just got an abortion earlier today without telling my family. I am 18 years old and me and my boyfriend paid for it ourselves. I wanted to get an abortion when I first found out I was pregnant at 5 weeks but my mother continuously talked me out of it. She cried and cried and fed me lies and fed me her own moral thoughts, and telling me "as long as I love it" nothing else matters, she came into my room literally every 15 minutes begging me not too, and my family even got the nerve to text and tell me that god hates me and will send me to hell. I just wanted them to stop so I decided to keep the baby.. my boyfriend was not happy.. neither was I. I knew what I needed to do. We could not support a child financially at all. Just because you love the child doesn't mean it deserves to be born into a terrible life. I had the worst childhood you could imagine. My parents are both drug addicts and alcoholics, abusive, and they talk c**p about me to my other siblings. I don't have money even with boyfriends help to get our own place to take care of baby and we would never have money for food, etc. I don't want to live off food stamps and the gov money like my parents do. Now my real question is after all this, how do I tell them I actually had an abortion? I can't just not tell her she's on me 24/7 about my prenatals and eating etc. I don't want to hear them talk c**p to me and put me down and make me cry. I'm scared they might even kick me out. How do I tell them? :(