Hi Redlipstick!
Have you thought about attending an adoption workshop or meeting?
I think your feelings are so normal to have, and often talking with others who have adopted can help so much. I'm not saying they will change your feelings, but they may help you better understand them, and to look at adoption in another way, if that makes any sense?
That might be a good place to start for talking and getting first hand accounts of adoption and foster care, and then going from there.
I just wanted to put that suggestion out there, and wish you the best of luck!