Take responsibility for your swimming future. Aerobic development must be done at an early age. Your swimming future is limited if you fail to take advantage of distance training at this stage of your career. There will be a time in every great race you ever swim where you have to make a decision - To push on through the pain or to back off. What you do on a day to day basis will determine what you do on race day.
Perfect practice makes perfect.
You do not become the swimmer you want to become the day you step up on the block and make your goal.