Disappointments are normal when things don't go as planned, anything at all may cause disappointments, but learning how to handle it well is surely a part of life.
Resilience gives us the ability to overcome challenging moments. It provides us with the strength to move on from unmet expectations and remain grateful for the things we have at the moment. Disappointments bring us set-back, and we feel like a total failure sometimes, but there are ways to recover from them, let check out some of the ways to do that;

pexels.com
You first need to be kind to yourself, in addressing disappointments, you need to take care of yourself in body and mind. You must learn how to eat well, sleep well, exercise, and speak to someone about how you truly feel.
At the moment when you feel disappointed, you must surround yourself with good people. Those with positive vibes validate your feelings and recognize your contributions to life and the hard work you put into what you do. Staying with people who make you feel less or down to the point of disappointment will only make matters worse for you.
Getting other people's perspective when you feel disappointed is also right, try to get a bigger and better picture from those whose experiences may surpass yours. These valid/helpful communications will provide you with a high degree of clarity, as you begin to see things for how they truly appear rather than how you feel about them.
You will be very surprised at how far little exercises and fun moments could get you at this crucial time. It may not be easy but engaging in activities you find fun and exciting is very crucial as lying down and feeling sad all day will not help you out at all. Some tasks would make you proud of your accomplishments, engage in those tasks, and make yourself happy that you did so.
Take this disappointment as an experience to help you learn, bear in mind all the failures babies experience whenever they are learning to walk, but at the end of the day it pays off well. With disappointments come lessons, take lessons from those experiences and either start a new path, take a new route, or continue on the same journey being an experienced person, depending on the lessons learned.
The worst scenario that could result from a case of disappointment is when you decide to brood over the negative experiences. Give yourself the time to come to terms with your circumstances and begin again, because if not, you will give room for negative thinking, anxiety, and resentments.
Disappointments shouldn't make you give up on life or even on that goal you are pursuing. Normally, fear may try to set in, but you have to learn to overcome the fear by standing up in the path of what you believe again.