Moving out of parents' house soon; how do I deal with anger now?

I am a mother, of a child whom is leaving home for the first time, she is 19, and I admit I have been short with her, and maybe a bit angry, I am having trouble dealing with her leaving, and I think I have dealt with it very wrong, The closer it gets to her going, the more anixous I get, the more worrisome I become. Personally, for myself, It is my fears that I did not teach her everything she needs to know to begin her life's journey without my guidance, did I teach her all she needs to know to protect herself, and to be a productive, happy adult? I have wrongly projected my feelings to my daughter. I want so much to just tell her, that the anger is my fault not her's I have not found the way to tell her these things. I have confidence in her , but I am having trouble dealing with the fact she is no longer my little girl, but my young adult child whom is beginning her adult life. I will always be here for her, and I also fear she will no longer need me. I am sure that your parents do not realize that they are even doing this, it could be them just trying to make your leaving easier on themselves, or your leaving easier for you. I know that in yzing my situation, I am the one whom is trying to make it easier for myself, selfishly, I am not saying that it is ok to do this, and, trust me I hate myself for it. I would try to find a way to communicate with your parents before you go, I know I am going to talk to my daughter soon! I never want her to think she cannot come to me for help when she needs it. Talk to them soon...