“New research by American oldness profs has revealed that senior citizens who believe that age affects memory are self-fulfilling prophets. They score much worse on memory tests than those who don’t believe in decline with age” —Oldsters: If you think you’ll lose your memory, you will
That’s informative. I’m convinced that you can achieve nearly anything if you really want to. The other way around it also works according to this article.
Therefore, if you are very pessimistic you’ll probably see more bad things than other people. And if you are very optimistic you’ll probably see more good things than other people.
In conclusion, pursue your goals in life, believe in yourself and be a bit optimistic.