I feel this alot. I contemplate my identity and reality almost all the time and feel invalid. Like i'm a glitch in the matrix.. Sometimes I just want to "enter" someone else and become them. I get the urge to delete every trace of myself on the Internet. it's so annoying because everything I do feels fake and "not quite right"...The moments when it happens the most are when i'm creating things/doing things I like. but it can happen anytime.