Any professional in any walk of life learns in a structured way, you learn to draw step by step, someone else will have learned to drive step by step.
Schools are set out in a step by step system, Every last thing that you learn as you learn to draw step by step will be a part and a base for the next part of the learning process. Not to say that its impossible to do anything without being shown, But If you can get to the way of thinking that of all the people that lived before you, they all learned to draw step by step from someone who is more experienced than them,
So they had the benefit of someone else`s experience, added to what they learned from the last person and then passed it on to the next, you should first take advantage of someone else`s know how to learn to draw step by step from, then add to that knowledge and one day pass it on again possibly. I know we are only talking about learning to draw step by step,
But this is the way of the world with pretty much anything, Men did not jump from a cave into a 5 bedroom villa, they passed information on and know how, that then get developed and improved only to be passed on again. We are all tiny parts of a huge picture, parts that all have a place, so the summary here is don`t worry if when you learn to draw step by step that it seems slow, because it may seem that way but ultimately it is the best way.