For being realist you need to be God. The meaning of 'real' varies from man to man.

Existentialism

optimist / 乐观主义者 / 楽観主義者。 Ha ha 呵呵 ほほほ。

Rational optimist, I love life, and science helps me to understand.

It is hard to explain because we are rarely stable in any state for long time. Depending on situations and conditions we change ourselves.