You live in a moment, you blink in a moment. A moment is eternity. The past is merely a label for moments that no longer are, and the future is the blank sheet of paper you're hoping is there when you turn the page. You can do nothing with the past moments, because they are not existing. All you have to work with is a moment; the present; eternity. Every moment is like eternity, because eternity exists outside of time. If you focus you will understand this. Live a moment and you have lived eternally. Eternal happiness is in your hands. Act now to achieve it.
Time is not real - we only have experience. Once you realize there is no future, rather only a moment, you will become conscious of experiencing life, and the choices you make will gain value and therefore meaning.