I agree with you on psychology being a science. Having a science background myself I'd risk saying the study of human's behavior is something only a scientist could embark on. The results of such studies are never the same as it changes with individual involved. But an average of the result of the study could be taken to be the launch pad on which subsequent cases are viewed. Have you read What Do You Say After You Say Hello? by Eric Berne? I read this book when I was like 12. I still find the analysis in the book quite exciting. I would have to reread that book as I did not grasp much of its message then. But it made an impact then that I still remember it now.