You're getting better.
My suggestion would be finding the shapes in individual body parts. Draw a hand, for example. Just a hand.
Draw a foot. Just a foot.
Draw a head. Just a head.
It's much easier to put together an imagined picture when you understand the basics fundamentals of parts of the body. Sure, a hand has five fingers, but where are the joints? How do they move? Where are the curves in the outline of a hand? If I look at a hand from this angle, how do I draw that accurately (trial and error process, really - there are multiple ways to tackle 'foreshortening')?
Learn to make the puzzle pieces, then later make a puzzle.
Also, drawing from life really helps. This sounds awkward as fuck, but if you're on a college campus with nothing to do (or even highschool in the hallways), try and sketch stick figures of people walking around you, doing actions, without them knowing you're observing them. Each stick figure should take maybe 30 seconds.
This sounds silly, but this actually is called 'gesture drawing', and it really reinforces proportion and anatomy understanding.
Good luck, bro.