I'm having a difficult time drawing a guy

[prime river]

I fixed it a bit

[fiery cape]

I would focus on more anatomy studies it can be difficult to draw full bodies in the beginning so taking about the different muscle groups and then combining them might help

Once you've mastered anatomy you'll be able to draw bodies from all different sizes and ages

If u learn how a 16 year old guy might look anatomically this might change ur perceptive on how younger or older people are shaped

So do separate studies of the head, neck, torso (front and back), arms and shoulders, and legs then move on to practicing whole bodies