Everyone who is No. 1 in his field got there because he aimed high and tried his best.
The people who become best tries their very best.
Anyone who tries his best may not come out on top, but will come close to it.
On the other hand, who thinks they cannot do it, because they do not have required capabilities can never accomplish anything as half hearted efforts never put anyone in top position.
So, your attitude should be one of becoming the best in whatever it is you ate doing, whether you want to become a politician, a businessmen, a scholar, a professional.
Try to become top in your field, set your aim at becoming No. 1 and give it your everything for the harder you try the better your chances of success.