21, pregnant, and feeling so alone..

I just found out that i am pregnant the day before mothers day. My parents are not together and never have been. Both of them are very supportive of this (i think they just dont want me to have an abortion). I have had two abortions, not because i wanted to, but bc my bf manipulated me into believeing all of his crap and i was just a stupid girl and did it for him. We've been on and off for 3years. Two pregnancies and now a third.. The stupidest thing is that we planned for this and now that i told him he wants me to give it up. Hes BEYOND manipulative. But i dont want to give this child up. I wanted this. I broke up with him and told him that i dont need his negativity and that im moving away to do this as a single parents. My sister hates him and calls me an immature child constantly. Telling me how i think the world should revolve around me. So shes all for another abortion. But im in so much pain from giving up two already. Two that i once i found out i immediately wanted to share my love with.. Im just feeling so alone right now.