I'm always doubting the existence of the "past," because I can never check if it really happened.
I'm always doubting the existence of "future" because it didn't happen yet and thus should not exist.
And I don't believe in the concept of "present" because it is an infinitely small moment, so small that it doesn't exist.
Yeah, perception is another jerk. They say the world doesn't revolve around me, but it does when I see the world my way, which is all the time.
Because I can't see anyone else's perceptions, I can't be sure if they exist either.
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Points have no dimension. Things cannot exist unless they have dimension. So lines don't exist, planes don't exist, and space does not exist because there are no points to define them.
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I have issues with philosophy.