To the question, "Can (should) I do it," is first another question:
What is "it" (task or more...) that I am to do (should or could do)?
But then, more questions...:
- How many times have you thought, I can do it, only to discover that "it" is more (or less) than you considered before; the effort, costs and benefits?
- How many times have you, even with a good sense of it, continue to to try for one reason or another?
- How often do you immediately and impulsively stop, accepting that either "it" is beyond your grasp or not worth the anticipated, added effort?
"Keep trying", I say, and find a source of hope and help that keeps you there, "trying".
Thinking of trying and failing, I think of a film, Running Brave: based on a true story, the unlikely victory of a 10K Olympic runner, Billy Mills, does not give up/in, but keeps on trying. From time to time, this video and the actual race, person, is visited for some of that sometimes needed inspiration; and below, a link.
Running Brave - Billy Mills