That drive you show for your studies is inspiring. All your efforts on working out your problems is commendable, your observation skills are strong, but, having a little bit of someone else's knowledge and experience goes a long way in getting over the human figure drawing hurdles.
My advice is that all that energy and hard work should be directly funneled into learning the very basics in proportion and construction from folks who have figured it out beforehand. Learning a standard proportion (there are several formulas) will cut down on guessing where structural landmarks of an average normal human are and being able to construct a basic mannequin will help you in knowing where the articulations of forms are.
Learning ALL this will in turn give you an informed point in which to draw from life.
Laying in and designing a figure comes before learning anatomy details. A lay-in s your simple blu-print before your details. A proportioned lay-in gives you a place to put your anatomy in.
Since you are on a self- learning path, If no one's mentioned them before, I highly recommend starting with Andrew Loomis for a first approach to proportions of head and figure: Head & Hands and Figure Drawing
Also John Vanderpoel's The Human Figure will fill in observational keys that explains the design and planes a step further.
These are pretty solid indestructible cornerstones to drawing great figures.
Keep up the good work!