i think therefore i am
i see therefore i believe
i feel therefore i know

reality is the surroundings and conditions put on you (check out platos cave)
existance is your take on your percivement of reality and own processes

i guess there is no definative.

i think to exist is to know you exist on some level. wether this is just an automated idea of survival or a deep philosophical understanding.

wether or not we do exist or reality is a mirage. it is real as it is the only reality and existance we have

peace