Yep, I definitely need to be needed. I've never really been sure why, but I imagine validation needs are part of it. I find this especially true at work - I enjoy being the go-to person. But you're right, Abaya - there are limits. I don't want to need anyone else to the point of co-dependence, and neither do I wish to be needed that way. Any phrase such as "I can't live without you" scares me. "How did I get along without you?" is okay.
Just enough to know I'm an important part of their life, and that I'm USEFUL - that's a big part for me, I really enjoy being useful.