You're a real person. No matter what anyone says. You exist, don't you? You have your own opinions and your own thoughts.

You can change your mind. You breath. You love.

How do you not exist?

And just because there was nothing before- that doesn't mean it's because of you. For all we know, there might be nothing in the after life and that's just that. So don't worry so much. I'll be with you.