You are a paragon of ambition and hard work. At an early age you knew exactly what you wanted and worked hard to achieve it. This built muscle, backbone, and good work habits in you at a very young age, giving you a head start on most of your peers.
Not only are you far ahead of the crowd, but you're a faster runner. You will achieve just about anything you set your mind to, and in the rare event that you fail, you'll be able to pick yourself up, brush yourself off, and get back on track. On a physical level, you could be wiry and muscular, with natural athletic ability. Good form and posture are a must for you, as is regular exercise to keep up your strength and endurance. You're tough, not easily defeated by situation or circumstance. You're so serious, it may be difficult for you to relax and enjoy yourself, but fun and rest are vital for you to keep your youth and flexibility. A body that stiffens as you age is a real danger if you aren't careful to keep your joints and muscles limber. You are competitive, and when you enter a contest, you do so to win. It's a metaphor for your life.