Everyone has to start somewhere. Nobody is born with a book already written and a publishing contract to boot. Every successful author had to experience exactly what you’re experiencing right now. Oftentimes, the only thing standing between publishing and not publishing is just whether or not the author is ready to give up on their work. There are thousands of editors, thousands of agents, thousands of publishers and literal billions of readers that all come with their own subjective tastes. You just need to convince one person at a time, and often the most important person to convince is yourself.