Advice on microdosing
yes, @least until you notice it. Then (if you wish/no set rules or dogmas) stick with the bare minimum once you feel it (more for beginners). It can really twerk people out (newcomers) when they take too much for too many days. Try to keep it to no more than 14 days for starters once you reach your point of reference.
Figuring out the calling is a tough question to answer as its person specific. You don't have to see a blinding white light in order to feel like you've been called - just try not to over think it. As for the meditation - keep at it. Most people when they first try meditation feel like they are useless at it for the exact reason you stated but actually that means that it is working! You are actually noticing the endless internal chatter and dialogue - you are being mindful of it and you're shocked to see how incessant it is - just keep noticing that. Meditation is not about blissing out for a hour while sitting in a lotus position, it is simply observing what arises and falls away. When you first start meditating, the chatter which is usually like background noise suddenly gets the volume turned up to 10 because you're not being distracted by anything else so it feels like you're doing it even more.