Yes, it's fine. For some reason, this popped into my mind, from "The Rubaiyat of Omar Khayyam," translated/paraphrased by Edward FitzGerald: Ah, make the most of what we yet may spend, Before we too into the Dust descend; Dust into Dust, and under Dust to lie Sans Wine, sans Song, sans Singer, and--sans End! And, with regard to "using our time," the "Jack London Credo" is not found in Jack London's writings, but was attributed to him by a biographer, and at least one scholar thinks it is probably authentic: I would rather be ashes than dust! I would rather that my spark should burn out in a brilliant blaze than it should be stifled by dry-rot. I would rather be a superb meteor, every atom of me in magnificent glow, than a sleepy and permanent planet. The function of man is to live, not to exist. I shall not waste my days trying to prolong them. I shall use my time.

You can say " We only live once, we should make the most out of it" or " Our life is short, let's make it fun" or "Our life is short, let's make the most out of it"