Introverts are amazingly strong and sober when tough situations come in the way. Since they pass a lot of time on reflection, they know themselves really well and usually do not make rushed decision based on the immediate emotional response.
Their strong focus and willpower come as a result of their frequent self-reflection during their alone time. They excel at observing issues from numerous point of view and finding the best solution to the problem.
This doesn’t mean that they do not feel overwhelmed by some stressful situations. The only difference is that instead of wasting their time on distractions, they will decide to spend some alone time and recharge. During this time, they devise solutions to the problem and ways to cope with it.