Thoughts lead to action Action repeated lead to habits and Your habits create your destiny. So you are the only one who can change it. Stop apologizing for being yourself. Performance both in karate and outside the dojo will improve, because a positive attitude breeds positive results. Don't believe me, try it for yourself and see.
Life is a self fulfilling prophecy.
Whenever you are the biggest, the best, or stand out the most, when you have got the goodies, there are those who look at you in one or two ways. They are so jealous of what you have, or cannot wait until the day that they can pass you up and have more, or have equal. The only way that they can see you is as an obstacle in their way. Another way is with envy. They are so envious and jealous of you that they cannot see themselves clearly.