Scary moments

I have dug myself in a deep hole. So I told a friend that I would have a sibling for his daughter and he talking about working on one next month so the child can be born next year. But, I am hoping to be pregnant by christmas but not by him, I have someone else in mind who wants to have a child with me. If the person I have in mind showed up at my door right now and said come on let's make a baby, I would jump to it. Now the man who I said I would have a sibling for is taking the shit to far, I honestly want my own kids, I was going to help him out after I had my own kids. I was just going to have the kid for him and sign over my parental rights, so I don't have to see the man again. I wish I never told him that I would have a sibling for him, even though it would be selfless thing, but I don't anymore especially when I already want to be with someone. What should I do, because I am scaring myself, and the other man creeps me out, I am so not attracted to him, he scares me.