Read this timeline, and focus on the first century and a half. Do you think those people were thinking that their businesses would someday merge to form the collosal behemoth that is Kraft?
Every big business was once a tiny business that saw an interesting problem in a new way. Every single one of those people probably worried about whether it would succeed, worried about competition, worried about paying their employees. You are not alone!
(Hat tip: Seth Godin)