Can you patent just an idea?

I’m 15 and have a great idea for an [very technology advanced] invention. Because I am only in high school, I don’t have the correct knowledge or understanding on how to produce this invention. I heard to get a patent on a product, you must make a stereotype/model… I don’t know how to make a stereotype/model. I don’t want to let this idea go to waste. So is it possible to just get a patent on an idea itself?