What’s my value on this planet? need to write and essay

I will assume that by ‘your value’ you meant what you can offer to the world.  Here are some practical things you can do that might be helpful:

Think about who you are as a person. In a group, what is your role - do you make everyone laugh, do you cheer people up, do you listen to everyone else, etc…? What do you do in your spare time? What would you want to be admired for? These personality traits may help you identify what you have been giving/will potentially give to people around you, which is the starting point to your value in this world.

Experience more things, read more things, learn more. Find what you like to do, find things that inspire you, and turn them into things that you can, in turn, share and offer to others.

Hope this helps!

adding more details about the struggle rainsford experiences as he swims to the shore