Identify your talents; that is one of the best things you can do for yourself.
Practise the work/activity you like to do. Even if you think you are not so good at it, practice will boost your confidence and change your idea about yourself.
Don’t compare yourself to others at all. Of course, competition is good but only at certain times.
Concentrate on your growth.
If you believe in doing something for others, you can only do it well when you are capable.