When I first started using Nim I was a snake_case person, and I was also put off by camelCase as the preferred style. Fast-forward a few years and I got used to the camelCase and moved on, focusing on what I want to build instead of personal style preference.

The identifier case style issue almost never comes up in practice. My advice: if you really want to give Nim a chance, don't get hung up on this issue, just adopt the community convention and enjoy the language.