I have been learning to play drums for a little over a year and as I progress into learning a bit more complicated stuff I noticed that I can't play something faster or implement deatils(like ghost notes) with my weaker(left) hand. It just feels unnatural,sounds sloppy and my hand gets tired really fast. I just can't find a way to relax it when I play faster. I already do some exercises to fix this but I would appriciate more advice on what to do to improve this. Maybe the problem,at least one part of it, is that I learn by myself from books and internet because I don't really have money for lessons.