I don't think the height thing is even relevant to actual incels ( You're 15 though, so I don't even know just how much of an incel you truly are ).
There are, of course, hundreds of millions of normies, not to mention in non-white countries, who are below 6'0. Now of course, being tall is one of the prerequisites for climbing up from normie to Chadlite or Chad, along with the jaw, brow ridge, muscles, clear skin, etc. But is already well know that all women want Chad, especially for sexual encounters, while merely settling for normies. But incels are too ugly in the sum of their body to even rise up to the level of making it as a normie manlet with a GF, so what's the point on fixating on lacking Chad's height. It's just another item in the bucket list.