17-year-old girls who know everything but can't do it may be caused by the following reasons: 1. lack of practice and experience: although you may have learned a lot in school, applying knowledge to practical problems in real life may require more experience and practice. 2. Self-confidence: You may feel that you don't have enough ability or experience to complete a task. This may cause you to be afraid to try or give up. Obstacles: You may have encountered some technical or other obstacles that prevented you from completing the mission. 4. lack of motivation: you may feel bored or lack motivation to complete a task. This may be because the task itself is not interesting or does not match your personal interest. 5. Lacking the right guidance: If you need help, you may need to find the right guidance or mentor to help you overcome obstacles and find the right solution. In short, 17 years old is an important stage in life where you can try to explore and try new things and learn and grow in the process. Don't be afraid of failure, believe in your own ability, seek help and support, you will definitely succeed!