Recently I watched video about some English (US) vocabulary(http://www.youtube.com/watch?v=ZOOSIPzi3Ls&t=16m54s) where the guy says that adding 'myself' to the end of the sentence with structure 'I've never' makes it more natural and doesn't change the meaning of the sentence.(E.g 'I've never been to Spain' and 'I've never been to Spain myself').
Is it really natural and are there any rules when I can use it?
I've never thought about it myself.
I've never had this feeling myself.
I've never read 'Heart of Darkness' myself.
I have never traveled by airplane myself.