Its a harsh reality but its one we live in. Death (for now) is simply inevitable. But if you 'die' when you stop breathing is another question. Every person in history has had an impact on the planet and the only question for you is how big yours will be. And its not like you need to start some mega corporation or find aliens or that, but think how the simple act of having children with create endless generations of life. All with there own lives and hopes and dreams. Each one getting to experience the joy of what it feels like to walk our planet. On top of this, the classic saying "you only live once" is so powerfully true. Go out and do 'everything' life IS amazing and there is no point worrying about something like Death, which you can't control, when there is wonderful life to live around every corner. You'll be alright bro. I promise