We all worry about the stresses of life. Telling people you are worried by email makes it seem as if you lack confidence in your abilities. If you are worried, don't bother saying that to anyone--just express what you are concerned about and offer solutions.
I'm worried about my presentation.
I'm worried the client will not be satisfied.
Worried is the reason people are not confident. Being worried comes from imagining a bad or worst case scenario. Its two components are thinking ahead and fearing a negative outcome. When you find yourself thinking ahead to the day of your presentation or project submission, summon a positive image of a supportive audience and an impressed client. Smile, hear the audience applauding, and feel the firm handshake of your happy client. If you are unable to imagine a positive image, then focus only on the present moment as you complete the project and prepare for the presentation.
focus on 致力于； 使聚焦于； 对（某事或做某事）予以注意； 把…作为兴趣中心
Their talks are expected to focus on arms control.
They focus on overt discrimination rather than insidious aspects of racism.
His administration's economic policy would focus on reining in inflation.