It's common to feel disappointed when we don't get the expected result. But if this happens more often then I would say we must reevaluate how we are setting expectations! Also, we should take a deeper look at how our emotions are working towards it so we can work on that too if necessary.
- The simplest way to evaluate if we are realistic or not is by asking ourselves what we really expect from the situation. It's true, it's very difficult to realize whether our expectations are realistic or not. But we can try to think objectively or try to see it from other points of view.*
Another thing is knowing what makes us expect this. Fact checks your expectations. Note if those facts will not be available to you what your results will be.
For example, if you are expecting a promotion in your workplace at the end of the year, first think whether it's realistic or not. Is there any possibility, your company wants it or not, your workplace promises something or not and something like this. And most importantly create the cause to give you the promotion, show your effort. And thing what if it will never happen.
Preparing ourselves for the worst is always a good tactic. But if you don't want to focus on the negative side only then work on setting your goal and desires realistically. I would say, we should keep this in our mindset that we may not get it but we will try our best and this failure will not let us down. Keeping our emotions strong no matter what can always help us to be realistic.