Hi @Dragphan,
I would said your mannequin are okay but thats not the first issue I see first hand when I look at your work. The issue is more on the understanding side of learning to draw what I means is:
Everything you put on the paper when you sketch are landmark, I should even specify it are just visual landmark thats all perspective anatomy etc are useless first and foremost drawing is learning to draw from observation and learn to see the world as it is and not as we think it is. So when you put your mark on the paper and form this mannekin remember they are just visual landmark to help you to draw the subject they aren't really limbs torso hips etc
Anatomy, Perspective etc are meant in a more designing perspective and is a stage you learn when you have already learned to see and simplify the visual reality on paper with lines shapes shades colors texture.
You feel weird when putting the outline of the subject because you don't have enough visual landmark and you try to focus on your knowledge when you need to focus on your sense your eye which is what need to be develop
So I would advise you first step draw lightly your mannequin to help you have a point to start from a visual landmark then synthetise the subject in an abstract way. This means simplify what you see with only straight lines from a saillant point to another and try to use the smallest amount of lines possible. After that you can complexifiy it by adding more line but if at this stage the sketch has issue you can correct them before working on the simplification of the shadow which retake the same logic.
Hope it helps you
