I have only told one person in my life I loved them, not including relatives, and I'm not sure whether I actually love some of them, or I am just obligated to tell them.
I have barely said it to people as a whole. I have told people I love you as a friend (and I emphasize friend) more often. I don't say it often except for a long distance thing I had and in that situation I did it more because I felt kind of helpless not being able to let him see it in my eyes (body language) and so on .. Not sure I could ever do that again. I like to be able express my affections.