Focus Your Thoughts
Avoid dwelling on things you cannot do or that are beyond your control. If you are shorter than other opponents at a tournament, there is nothing you can do about it. However, you are faster than they are, so take advantage of it. Concentrate only on things that you can do or have control over. If you have no control over a circumstance or situation, no amount of worry will change things. Focus on what you can change.
Set Achievable Goals
Set high but realistic, achievable goals. Unachievable goals foster failure. If you are a 10-year-old white belt, ninth degree black belt is an achievable goal. If you are a 40-year-old white belt, you need to set you goal a little lower. Set intermediate goals that lead to the ultimate goal. Successfully reaching each intermediate goal will build confidence toward reaching the ultimate goal.
Reframe Unpleasant Tasks
There are times in life when you must to something you do not enjoy doing to accomplish you goals, such as pushups or repeatedly practicing patterns. Do not let them stop you; simply accept them as the price you pay for success. Reframing means you view unpleasant things, not as a something to avoid, but as steps toward your goals.