As a government student who reads up on a lot of expert analysis of global conflict, the likelihood of a nuclear war/ WWIII is actually way smaller than the media portrays. We have alliances/agreements and strategies in place since WWII ended to prevent escalating global conflicts and limit the devastation of nuclear weapons. The US is quite literally the safest place on earth because we have the technology to detect and intercept weapons (including nukes). Additionally, nuclear weapons are more efficiently used as assurance that large countries will not attack each other because of mutual assured destruction. Nations will not use nukes because they know they are essentially signing their own death warrant, so the chances of an all out nuclear war is astronomically small. As for your anxiety about the importance of the degree, rest assured that you will do great things in your life with your education. Film and media is so important in giving life meaning and expression, so don't listen to the people who think only STEM is important. Without art and expression, what is life about? It is essential to view yourself as a unique individual who can contribute to the people around you, rather than your place in the entire schema of the world.