I've been struggling with this problem from the beginning. Even with traditional media, and especially with digital. For years I thought artists who could perfectly guide their hand where their brain intended must have had some kind of super power. Or they were using a lazy mouse. But there's no lazy mouse in traditional drawing!
That was, until I came across a couple of tips and tricks to help with just this problem. I worked on these few methods almost every day for three years, and what do you know, it got better!
I could mostly guide my hand to draw where I wanted it to go. This was amazing, and I've been drawing like a crazy person ever since.