This is probably the #1 difficulty with achievement. Focus and Concentration are much more rigorous than we perceive. If you haven’t developed the most demanding of all disciplines, self-discipline, you will flounder and wonder why.
Authors trying to write are drawn away by mental prompts to check email, text a friend or get a bite to eat. CEOs are tempted mentally to make a phone call, check the headlines or the lunchroom while attempting to concentrate. Weight-watchers are tempted by food the most when they are actually trying to cut back. No one is exempt.
The good news is you can develop superior self-discipline while you increase your focus and concentration. Start small. Try focusing (and sitting) tightly for 3 to 5 minutes.
Increase your efforts to 5, 10,15 minutes as you develop stamina and master the 3–5 minute range. That’s right I said stamina. One becomes conditioned to sit, focus and concentrate for up to an hour at a time.
I know people who sit and write for 4 hours and think nothing of it. They have the stamina for it. They are conditioned for the task. They weren’t born with this ability. They developed and cultivated the unique ability over time.
I wish you more than luck!