How can i get people to listen?

my biggest mistake is not letting whats on my mind be known to other people. i have so many intelligent thoughts that i would love to tell people, like theories about living organisms, theories about how people percieve truth and many other things. i also have a few ideas on books and movie plots. i wish that i can tell the world my thoughts and maybe have a chance to manifest these thoughts on paper and have people actually read them. the thing is, im only 18, and so many people wont listen to things a youth will think of. also, many of my ideas disagree with modern western culture and are against most of the beliefs of my religion, which scares me because im afraid that everyone in western culture and my religion will shun my ideas. how do i express my ideas and/or thoughts?