You are right, but not entirely. There is no universal one true reason to exist. You exist because, you do. But there is also no reason to really fall into despair over that fact. There is more to life than just plain existance. Everyone just forges their own reason to live. Some live their passions, some live for their families, I just live because there is even less reason to die really, and I have hope that someone will give me reason to wake up every morning, go to work and do my best. I think you should too.