When you realize you have still many things to learn

Being 35 allowed to face new "what am I doing with my life" type of anxieties. I have a corporate job, but I realized a need a plan B (and C and D and E), and it was teaching English. I have limited a skillset, but English is included, so why not. However after the course I realized that I had still much to learn about the English language, so new anxieties arrived to my life. I really enjoyed learning and it was fun, I'm just not sure how I would manage with this new knowledge, but will see this in the future :)