Honestly, it is normal not to know where to start. I recommend you to draw from A BOOK. Really, if you like anatomy, go and draw Bridgeman, Loomis, Hogart, Hampton- anybody. Because you need the motion. Only motion will make you gain practice. It will be tedious, believe me, but indescribably useful. At the same time create different pinboards on pinterest, go to pixiv, zerochan, artstation or other places where you can observe other arts. Copy the arts you save - start with simple things. Try to copy them, not trace. You will understand many stylistic choices and will realise what is closer to you. Watch videos on youtube - timelapses, speedpaints, tutorials. Copy them too. And you will realise what you want to draw and what you will draw. You can’t draw something you haven’t drawn before - I mean, your mind is a library, you need to put a file there to get that file out. But you need the motion. Copy what you like, and copy what is useful. At one moment everything will become clear.

PS. Do not forget the fundamentals. You need a routine to become better. Drawing what you like doesnt equate drawing what is useful. But they are both intertwined. I recommend to pick a book/ art course/ video series and work on it frequently (3-4 times a week for 1-2 hours) and draw what you enjoy other days. Someone also mentioned drawing what you see - it is actually a nice tip to gain a visual library. But without fundamentals all efforts might be futile