Your problem: you feel you can only draw things other people have already created. Your drawings never look like something truly yours
Step 1
So you can draw circles and straight lines, right? That's not really good. You may be stuck into mathematical rules and technical drawing - you're great at repeating, but not creating. How can you help yourself? Well, the first step of this tutorial is good for you too, but there's another trick you can use.
As I said before, style comes from diversity. If you're redrawing a picture carefully, line by line, without adding anything new (because it would be a mistake!), you can't end up with something different. The original wasn't yours, and your drawing is just its copy. I don't say you shouldn't follow tutorials anymore - you should just be more creative and - paradoxically - less precise when doing it.
How to lose a reasonable bit of precision? Let's start with this simple exercise: draw a few simple shapes with your hand shaking, as if you were being nervous. Do it until you feel your hand is relaxed.
Step 2
Let's try this simple tutorial now. Do this the same way as usually, but in Step 4 shake your hand when drawing the final lines. Draw a few of these heads, changing the level of twitch every time.
iwanttodraw-2-2-lose-precision
Step 3
Surprised? Every head looks different than the original, but you can recognize what you've just drawn. Also, you used the same proportions for them all, yet none of them looks identical. How could it have happened?
When you were learning how to write, your teacher wanted you to repeat lines from a template. You were spending a lot of time drawing (not writing) every single letter as if it was a small masterpiece. Then, with time and experience, you developed your own character of writing, your own style. Your letters look different than mine or your friends' - still, we can all read what you write. Your style changed because you wanted to write fast - to write down your thoughts, not to draw perfect, but meaningless letters.
Apply this rule to your drawings. Think about what you want to achieve, not about the lines. Draw fast and your personal, unique hand movement will have a chance to shine.
Step 4
There's another thing that adds up to your style - creativity. Do the same tutorial once again, this time changing the step results to your needs. You're learning how to draw a dragon head, but dragons in your mind have longer mouths? No problem! You don't need another tutorial for it, just adjust the rules to your needs.
Step 5
What to practice?
Try to draw things from your environment with shaky, careless lines, without taking care about the effect;
Sketch a lot! Don't think about the result, just let your hand practice its natural movement;
When following tutorials, stay creative - change lengths, shapes, distances and see where it takes you.