As a competitive person, I want to achieve things. Set goals and reach them. And as someone who meditates, I want to be present and accept reality as is. But if I want to accept reality, why would I want to change it? Paradox-alert!
Mindfulness practice preaches the acceptance of the now. That seems to contradict wanting to compete and improve things. In itself, there is absolutely nothing wrong with having goals or wanting things. They can drive change to improve your life.
However, these goals need to come from a healthy foundation. So, acceptance becomes a prerequisite. It is a state from which you can start with improving. Let me explain what I mean.