Compound interest is merely one example of an exponential function. Human beings have great trouble thinking in exponential terms. It is far easier to think in linear terms and, because this is our natural instinct, most people vastly underestimate the power of investing over a long lifetime. Compounding takes a long period of time to work its magic and we live in a society that prizes instant gratification above all else.
Part of getting older is gaining insight into the reality that living a good life has far more to do with factors such as health and family that simply cannot be purchased with money. However, money is definitely a prerequisite for living a secure life. Since poverty almost always guarantees misery and since anyone in the middle class or higher can easily attain financial independence over a lifetime, there is no excuse to persist in irresponsible spending. Your future self will thank your present self for being prudent and sensible.