How can i sharpen my pencil when i don't have pencil sharpener?
If you don't have a pencil sharpener, there are several ways to sharpen your pencil:

Use a knife: You can use a sharp knife to carefully shave away the dull wood and expose the graphite. Hold the pencil firmly with one hand and slowly shave away the wood with the knife held in the other hand. Be careful not to cut yourself or break the tip.

Sandpaper: You can use sandpaper to sharpen your pencil by wrapping the sandpaper around the pencil and rubbing it against the paper in a circular motion. This will help to sharpen the tip of the pencil.

Use a nail file: If you have a nail file, you can use it to sharpen your pencil. Hold the pencil at a 45-degree angle and gently file the tip in a circular motion until it is sharp.

Rub it against a rough surface: You can also sharpen your pencil by rubbing it against a rough surface like a wall or a brick. Hold the pencil at a 45-degree angle and rub it against the surface in a circular motion until it is sharp.

Remember to be careful when sharpening your pencil and always make sure the tip is pointed away from your body to avoid accidents.
Is it possible to sharpen a pencil with just my nails?
Yes, it is entirely possible, but it would be ill-advised. It is also possbile that you might grind away your nail before you managed to sharpen the pencil, however, depending on the health of your nails.
What difference does it make to have your pencil sharpened?