Step 1. Close your eyes
Step 2. Picture yourself doing a video blog. Don't worry about what your blogging about necessarily, just focus on doing the video. Sitting in front of your camera or webcam and calm but enthusiastically doing your vlog.
Step 3. Now picture yourself scrolling through a long list of vlogs you've already done. Click on a few, and watch as you easily and effortlessly vlog about any topic that moves you. See all the page views showing your fans enjoying your vlogs?
Step 4. Have COURAGE
Courage - Grace Under Fire
The ability to continue on, despite your fears.
I know where you're at, as I to am in the process of building my vlogging and speaking skills. I can tell you right now, that the only way to build your confidence is to stop worrying about what anyone will think of your vlog and do it just for yourself. Don't worry about how "good" you are, or whether or not your vlog compares to others. Just do it because you love doing it, and the confidence will come with experience.
Let me know if you need any coaching =)