What makes you feel like you need to be alone?

Stress and pressure, they are like a time bomb, the moment I start feeling stressed or pressured I know I have to get away otherwise I will not be able to calm down, so I go for a walk in the forest, which always calms me down and lets me think about things clearly.

People also make me feel like I need to be alone, not necessarily because of anything they do, its more about how I perceive the things others do. Sometimes I just feel as if everyone is against me, at those times all I want to do is to be alone, by myself.