Not all people start off big, most people start off small. You have to enjoy what you are doing, don't say stuff in a monotone voice or be boring, and most of all, you have to be patient. Nothing happens all at once, you'll slowly get more and more subs, and you'll become popular one day. Don't forget, pewds made videos for 2 years. And of course, you have to have something that shows it's you, if your just "a person on youtube", your channel would grow ever so slowly.