I personally don't believe there is something wrong with you, or anyone else, for being insecure. It does seem to have sort of a reputation for being..."shameful" or..."uncool." But it shouldn't. If you can get your hands on a copy of "Attached" by Amir Levine, it might ease your insecurity about being insecure.

PS: in your original post, were you talking about your boyfriend? Or a friend? You deserve people who lift you up. Good luck