My father has ruined my faith in humanity. What am I supposed to tell my children?

I'm having a really difficult time coping with life. I'm 24 and I was raised by the man I thought was my father my whole life. I loved (still love) him very much. He was a great dad and my best friend. He had always told me my mother died in childbirth and I believed him. He was arrested for child molestation and several counts of rape 2 years ago. I was so confused. My father had never ever hurt me so I didn't understand how that could of happen. I didn't want to believe it but the evidence against him was over whelming and he later confessed. He was a principle of one the schools in the city and over a period of about 15 years he violently abused a countless number of children. I felt disgusted and angry. I mean, he was there when my daughter was born and had babysat her countless times. All I could think about was what he could have done to her (she's 3). I was enraged with him and destroyed every picture of him and everything he had ever given me. I never wanted to see him again. I took my daughter to every doctor I could find to see if he had hurt her and tried to talk to her and ask if he had done something inappropriate to her but thank goodness he hadn't. Before my father went to prison, he confessed that I wasn't his child but he had kidnapped me when I was about 2. I thought I was dreaming and wanted to wake up. Why in the hell would he tell me that? I honestly would have rather died than know that. Since I always thought my mother died in childbirth, I felt in was my fault she was dead and I very much wanted a mother and to find out the only parent I ever known was a monster made me feel all alone. Any decency I thought he had left was gone. I never saw him again and that was a little over a year ago. I had a private investigator look into what he had told me and after some months he found who he believes are my real parents. The story they gave the police matched the one my father told me in every detail. I chose not to contact them. I don't think I'm emotionally ready to let anyone in my life right now. The only person I've told this to is my husband and he's been very supportive. I have a 3 year old and a 2 month old boy. I don't know how I'll ever explain this to them. I feel I was a much better mother before all this and now I feel like I'm failing as a parent. I can't trust anyone anymore and I just hate people now. I started therapy a week ago but will I ever get past all of this drama?