All of your feelings are completely normal. Someone once told me, when you hold your baby in your arms, you will know that it's meant to be. Of course that's hard to imagine until they arrive, but it's true. My DE baby is almost two and it's weird to even think back to all of my fears and the fact that we don't share genetics, because I am so in love with him, he is so in love with me, and we have such a strong bond. Hang in there and allow yourself to go through whatever emotions you are having and just trust that when your baby is here, it will be the most amazing thing ever.
If you haven't already, join PVED.org (parents via egg donor). It's a great resource and support group