Don't feel bad. According to ADVOCACY: Championing Ideas and Influencing Others, by John A. Daly, you are in some pretty impressive company.
Companies unreceptive to advocacy efforts often discover that their brightest “idea people” leave in search of more hospitable homes elsewhere. Some of today's most successful companies were created by individuals who were unable to convince movers and shakers within their former organizations of the merits of their ideas.
Sam Walton, the founder of Walmart, started his career as a franchisee in the Ben Franklin chain of stores. Walton tried to convince the Ben Franklin executives that his model of buying directly from manufacturers and offering deep discounts would lead to incredible opportunities. They didn't listen, Walton implemented the idea himself, and Walmart became an international phenomenon.
Steve Wozniak, a co-founder of Apple Computers, was working at Hewlett Packard when he and Steve Jobs designed their first personal computer. Wozniak had signed a document at HP saying that whatever he designed as an employee belonged to HP. He said, “I loved [HP]. That was my company for life. So I approached HP .... Boy, did I make a pitch. I wanted them to do it. I had the Apple I, and I had a description of what the Apple II could do. I spoke of color. I described an $800 machine that ran BASIC (an early computer language), came out of the box fully built and talked to your home TV: And Hewlett-Packard found some reasons it couldn't be a Hewlett-Packard product.”
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Truth is...what matters is not whether someone higher up the corporate ladder believes in you, but whether YOU believe in you.