This is quite insensitive and a poor analogy. Telling someone who's struggling to "Get your head in the game" is unhelpful in the extreme. It's like telling someone who's drowning to "Just swim better".
Free climbing is a high-risk pursuit. A free climber goes on occasional expeditions where they solo a route, but before then, they train with others, have spotters and partners during route practice, and whole communities to provide help, support and emergency contact should things go wrong. Alex Honnold doesn't just rock up to a mountain (if you'll forgive the pun) and solo it every day for months on end.
It's very difficult to just put everything aside and focus on a singular task for the amount of time it takes to complete a significant software project. Once the initial enthusiasm wanes, keeping going can be a real challenge when you're on your own. The OP's concerns are absolutely valid and deserve respect.