Let's say you feel bad with more athletic people than you are. This feeling will gradually worsen as people watch how many kilograms of weight gain people in regularly working at the gym and how fast they are running. Focus on what you can do better than the previous week. Maybe you can run for 5 minutes more, or maybe you can increase the weights you lift .
Anyone is responsible for the behavior he has done. In this way you both feel better about yourself and increase your motivation. You see that increased confidence high amount of your own success. Even more beautiful, you can focus on what you are doing and ultimately reach the end you desire. The important thing is to put the right targets and focus on what you can achieve.