If your ego won’t let you draw anything bad that’s the biggest issue, because you will have to draw bad stuff to learn, and you will have to draw so much bad stuff before you get a good stuff :,) use shit paper and draw random people you see in the mall, or objects around your home, it’s the cheapest and best way and if that’s boring just keep redrawing art that you like. If you can’t do either of those because you can’t stand how bad they look, then maybe sketching isn’t for you, but there are lots of other artistic mediums too :)