Loneliness. In my experience with dealing with depression, neglect, misunderstanding, shunning, heartbreak, and betrayal, loneliness is the one thing that sticks out. The only cure for it is filling the void with something significant. Even then, someone might only be in your life to fill the void, and be a shitty friend. Maybe all they want from you is money, but you continue the friendship anyway because the presence of another human outweighs the idea of being used for cash. Finding the right people in your life is not easy at all. Right now I feel as though everyone I've ever been friends with, including my ex girlfriends (2 long term relationships) have just been using me. That's a shitty realization. It's even worse when you add to it the struggle that you actively try to make new friends, but everyone in your generation is distracted by phones, preconceived notions, and lust for sex.