The biggest most unfortunate lie is "I'll get a job at the end which will make this all worthwhile and not the most expensive waste of time and mental health imaginable." This lie is told from all sides. Universities say it. Advisors say it. Postdocs say it. Parents say it. Students say it to themselves and to each other.
In English-speaking countries, being in 'academia' usually means being employed in a research and/or teaching capacity at a uni and not working towards a degree anymore. Some may say being faculty, post-docs are a bit in between.
Find a few people in PhD programs in the US and tell them you don't think they're in academia and see how they react.