Absolutely 100% possible to learn company building skills. No one starts off as a natural; like anything there is 10,000 hours of practice involved.

When I started on my journey 14 years ago I was shy, not good at selling, a terrible programmer, had no management experience, had no connections and was not a super strategic thinker. Now I am much better at all those things (except I'm still a fairly mediocre programmer). The last 14 years were mostly about learning how to be better at those skills (not all at once). The important thing about being in a startup was that I was put into positions where I was forced to learn them by doing (which was at times an incredibly painful process -- because most learning involves failure and these failures felt particularly high stakes).

If we could start by strapping a camera to my head and calling it a startup, and then create >1b in value across half a dozen startups in the next decade -- literally anyone who is reading this right now can be successful building a business.