Okay, not trying to be an a-hole, but never, under any circumstances, say you "gave them up"- i take offense to people who say that, and to me. I also placed my son with a family and it really hurts my feelings when someone blurts out, "oh you gave him up!??".
My story is my baby's father walked out on me when I was 7 months along an started threatening physical harm to me AND his son's life with the help of his "amazing" new(previous ex- so, not so new)gf. I did it for my son's safety and a chance at a good life without my baby boy having to deal with a dead beat dad who couldn't wipe his own ass and was more concerned about being on welfare than getting an actual job.. I know what I did was the best for my little angel, and I don't regret it. Yes, I want to cry, yes, I feel horrible about myself too, but at the end of the day- he's in great hands with a family that loves him more than their own lives
You're lucky that you're able to see your little girls often, I only see my son twice a year :/ you're a strong woman for making such a huge decision at such a young age. keep your chin up