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lillib I'm sorry you feel bad about giving your daughter up. I don't think it makes you a failure to give your daughter to people who were more capable of supporting her than you were. Honestly, I think lots of people have and raise children when they aren't really ready or fully capable of it, and it's the children that suffer in the end.
My mom told me she didn't want kids, but I am her biological kid. I used to wish she had given me up for adoption to a family who really wanted kids.