The prospect of being forced into the military just doesn't sit well with many young people. The government presents draft registration as a low or no risk proposition - a rite of passage to adulthood, like getting a driver's license. This cavalier attitude is reflected in Selective Service publicity material. These notices are sent to lists of young people purchased from state driver's license bureaus and commercial agencies that market products to young people. The basic choice is whether to register.
Some people register but place messages stating their opposition to war in the margins.
You should understand that this is a form of protest and does not necessarily have any legal significance later if you should apply for a deferment or exemption. The chief difficulty you face is that you have to make a decision now based in part on what you think may or may not happen later. Both registering and not registering have their r isks. On the other hand, persons who register may find it more difficult to resist the draft later. You have to make a decision for yourself based on what you think you can live with.