Always practice and practice. Sketch out shapes, a circle, or anything youd like. Then with a pen or different color, try to outline it as best as you can. If its wavy, its okay, keep on going. If youre on a big piece and you mess up, if youre 100% able to fix it, fix it. If not, own it. It'd be hard to own it, but just own it and keep practicing. Dont try to pressure yourself, if you do, the piece or drawing will feel forced and sufficating. Be loose and flexible with yourself. But always be sure to practice. Always know youre able to draw.