Self doubt and uncertainty is all conjured in your prefrontal cortex by your consciousness, this is why animals purely act on stimulus response from the central nervous system.
Your reactions are only reptilian in nature, so don’t be so hard on yourself, stimuli from the medulla oblongata and cerebellum control your fight or flight and emotional reactions, just like animals!
All rational thinking is done in the neocortex, Again, only humans have this part of the brain!
make a decision and stick with it.
Ignore all the doubt your consciousness keeps in.
Look after your brain!
+drink more water.
+get 8hrs sleep.
+eat more Meat & Mushrooms.
+blueberries are life.
+go for a 20min walk in the sun every morning.
+eat less phytates and lectins. +read an hour everyday.
+turn off all bluelighting and ultraviolet rays at sunset.
And Watch 99% of your problems disappear.
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To put it simply, nootropics are supplements designed with the intent of boosting brain power while maintaining brain health. Some refer to nootropics as “smart drugs” or the kind of pill that the protagonist in the film Limitless took that allowed him to maximise brain power and more. 
The truth of the matter is, nootropics are simply formulations that contain specific ingredients or concentrations of compounds that have been studied for their brain benefits. Most of the formulas you find in popular nootropics contain natural ingredients