We sometimes feel stressed because tasks that we are supposed to have finished are beyond our ability. If we try to improve our abilities to the point where we can do those tasks, that effort alone may reduce our stress. That effort will keep us busy so we can stop dwelling on feelings that we may not be good enough. I had trouble understanding what you are saying. I changed things around to say what I think you may be trying to say.

We sometimes feel so stressed because the tasks we are supposed to finish are beyond our abilities. If we try to improve up to a certain level, we may feel more comfortable doing that work instead of feeling stressed. We may be busy but we will not feel so much pressure if we are good enough.

We sometimes feel so stressed because the tasks we are supposed to finish have been beyond our abilities. If we try to improve ourselves up to a certain level so that the present work is within that level, then we may feel very comfortable doing that work instead of feeling stressed. We can be busy but never feel too much pressure if we are good enough.