Amy,
Just remember that the members who participate on these forums are just a small sampling of the community at large. Obviously, those adoptees who have no need to seek out a support forum aren’t going to be here, so what you’re reading is posts made by those who are out there looking for support.
While it is important to educate yourself on Adoptive Parenting – adoption has come a long way since the times when most of the adoptees posting here were children
So, get scared, educate yourself by doing some reading and then just go on…but don’t dismiss it – as you read, it does happen!
I know plenty of bio kids who don’t care for their parents

this isn’t exclusive to adoption!