Will I become bald if I do not seek treatment?
That depends on multiple factors, but first and foremost on the cause of your hair loss. If your hair loss is temporary (which is seldom the case for men) you should not fear losing your hair.
If we assume that you are suffering from male pattern baldness, there is a wide range of different scenarios for how your hair will look in the future. Men, who start experiencing symptoms very early on or suffer from a particularly aggressive case of male pattern baldness, will lose more hair over a shorter period of time, which can cause baldness at an early age.
Male pattern baldness is a chronic condition, which will deteriorate if not treated. Your chances for a full recovery diminish with every hair you lose. Timely treatment using the right combination of tested and approved drugs should at least slow down your hair loss, but will in most cases stimulate growth of new hair.