There's no need to be afraid of drawing. A pencil and a piece of paper can't harm you! So, if you are nervous about drawing, take heart and read on.
A lot of people do think that they can't draw. It can be down to something which was said to them at school, or just something they believe because it's so long since they did actually draw, and have forgotten the skills they may have had.
It is important to realise that nobody is telling you to draw and then show relatives and friends your early efforts. If you are going to feel stressed at feeling that you have to draw to please other people, then please think again. All you really should be concerning yourself with is getting something down on paper when you are beginning.
You'll need to get a sketchbook, and a quality pencil, and in the sketchbook you can draw or sketch whatever you want to. If you are a beginner, you are better off working with photos, but if you feel confident enough to go out in the fresh air and sketch or draw a tree, or an idyllic scene, then that's perfectly okay. The more you draw, the better you will become, and you shouldn't really be worried about whether your work is brilliant or not at such an early stage. This early stage should be about enjoyment more than anything else. You'll learn more if you're enjoying what you're doing.
Think about what you love to draw, and experiment with rough sketches of the image or images that you want to capture. Don't get frustrated if you can't get the sketches right quickly. This is really early practice, and you should be having fun, and by learning in a step-by-step way. you will actually learn from your mistakes, and these early sketches will sharpen your skills.
As you progress, you will gain the confidence to become more elaborate with your drawing. You should begin with sketches, then try more studied drawings, but drawings lacking fine detail. Once you are skilled in sketching and preliminary style drawings, then you should attempt to draw in more detail.
Draw because you want to, and it's up to you what you do with your work, who you show it to - if anyone. Enjoy it, and don't take it too seriously. You never know, though, you may become so good that you'll want to shout about your talent from the rooftops!
Here's one of my old drawings and links to some of my work.
Illustrations from my environmental novel From Ecocide to Eden on these two pages below.