lack of purpose
I know it's just a meme, but to address this seriously for a moment... I think this whole idea impacts people really negatively. It's bound up with the "meaning of life" thing, and it seems like a lot of people feel anxiety due to not having some grand answer for "what is my purpose in life?" &etc.
Objects have purpose. A hammer has a purpose. A bucket has a purpose. A flashlight has a purpose. These things are designed to perform a function, they have a purpose because their makers and users give one to them, and their nature is limited by that.
You were not designed to perform a particular function. You are not so limited. You are that which gives purpose.