Speaking from personal experience, for me its trust, I was abused daily as a child, Now I struggle with adults, second guess their every move, always believe there is a ulterior motive, Always assume that nothing is done for love, but because its for their gain
Socially awkward, I cannot hold conversations, as I was never taught how to hold them, withheld from friendships as a child, meaning I don't know how friendships work, and if I get a *friend* I end up treating them like shit, as I don't know what to do/say or how to act.
I could go on but you get the idea?