Not being curious. Education should never stop. You should constantly be seeking intriguing books, new ideas, different perspectives. Once you’ve lost your curiosity or pridefully believe in one opinion and one way of thinking, no matter your schooling, you have at that moment become poorly educated.
No way. I started learning computer science on the job when I was older than you. I took my time, asked questions, studied after work every day, got a better job, which led to another better job and another. In just 6 years of working my ass off, I’ve been able to rise the top of my field in IT. You can do it. Anyone can. Perserverance is the absolute key. When it gets hard, and it will… just believe in yourself, and do it anyway.
Good luck! You got this!