Fair enough, but keep in mind that Oreo cookies are a knockoff. But nobody thinks of them that way because they're the best known cookie of that type and usually the first cookie of that type that someone tries. It is the original in their mind.

If your customers are introduced to all of the products in your segment at the same time, they probably won't even know who is the "knockoff" and who is the original.

Also, when I think knockoff I think of some less than desirable product that isn't as good as the "original". Even after we know that Oreos are knockoffs, it doesn't change our perception of them because they make a high quality product that is desirable (if you're in their target market).

Many products that Apple makes could be considered "knockoffs" but again, most people don't think of them that way because they do an excellent job with design and use high quality materials.

It's probably a bit of imposter syndrome, but as long as your products are great then I wouldn't worry about going to market after a competitor.