Nietzsche says about our life:

There is no truth, no meaning to life in the world that is relevant to you, except the truth that you yourself give your life.

“… To give life a meaning:

that has been the grand endeavor of all that have preached ‘truth’;
for unless life is given a meaning it has none.

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At this level, truth is not something that can be proved or disproved:

It is something which you determine upon, which, in the language of the old psychology, your will.

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It is not something waiting to be discovered, (it is not) something to which you submit or at which you halt:

It is something you create, it is the expression of a particular kind of life and being which has, in you, ventured to assert itself.

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Because each particular life and being needs a fortress within which to preserve and protect itself and from which to reach out …..

and truth (your meaning to life) is this fortress.”