At this point I've equated vloging in public a lot to working out for the first time in the gym. You'll have initial insecurities about the prospect of it mainly because you're afraid of onlookers, you're afraid of being "that person", you're afraid of being judged all of which are valid hesitancies that normally arise out of lack of continuous practice. Do anything consistently enough and it'll become second nature where it becomes seamless to tune out variables around you and focus on your sole intentions.
Jeven Dovey has compiled some great tips to help you and I overcome that shyness that comes with filming ourselves in public whether it's for vlogging purposes themselves or IG Stories which at this point they're both the same.
I'm heading to El Salvador in January 2020 on a solo photographic adventure and perhaps the idea of being alone will make the process filming myself much easier because there's more time to focus and less compromising.