I guess this is a synopsis, though it doesn't say it is, so I can only review it as a finish product. Still, I'll assume to play to add dialogue, description, plot and all that stuff that makes a story. As it now rests, it lack all that makes a story, a story. Even this synopsis is lacking in the basics of grammar. The story lacks punctuation and a quick editing would produce:

Shawn experiences his life with the idea of running away from home to explore. Shawn is not a little kid, he is 23 and ready for his adventure. He runs into a very confusing situation and he believes that if he tries, he will be able to come to an end with fame or just a new life.

I'm not sure what that last part means: "he will be able to come to an end with fame or just a new life." Does he plan to kill himself? And is that is only alternatives? You might want to make that part a little clearer.

Hopefully you'll actually write the story and will keep in mind grammar as you do so.

I see you are new to the site and want to welcome you to Writing.com and hope you have many rewarding years of writing.