I started YouTube recently for several reason.
1) I got myself a video camera, and thought it would be a great way for me to experiment and learn filming and editing skills.
2) I read, watch, and listen to a lot of things based around productivity and success. One of the most common things is that you never see someone's beginning or middle, just the end when they become successful. I'm currently working towards several goals, and thought it would be great for me to see my progress, but also for other people to see that it takes time and a lot of hard work to become successful.
3) I'm not a confident person, especially in public. I've seen a lot of people, including the OP, talk about how YouTube has helped them gain confidence. I've heard this from a lot of the YouTubers I watch too, and thus thought that vlogging would help me in the same way.