Trust that everything happens for a reason
The universe has a plan for us and spirit is able to see with far more knowledge than we have about what is best for us based on that plan. When faced with disappointment remember that there is a bigger plan in place and that there is always a silver lining to every situation. I know from personal experience that some of my darkest days were some of my most defining moments (now that I can look back with hindsight) and I'm sure you've had experiences like that too. So you may not feel it now but trust that everything is not only happening for a reason but happening exactly how and when it's supposed to.
Most of us are creatures of comfort and as a result change can be challenging for some people. The more that you are open and receptive to change in your life the more you will notice your life flow with ease. That doesn't mean that life all of a sudden becomes 'easy' but it sure does make is easier to deal with. If you're not someone who likes or deals with change find ways to invite and accept change in to your life in little ways. Find something you do in your daily routine and do it differently. Travel a different route to work, wear different clothes, style your hair differently, try a new food, etc. Be warned though, if you do these small changes consistently and build upon them don't be surprised if you actually start looking forward change after a while!
Believe in your worth
Often when things don't work out the way we hoped or planned we feel as though it's a reflection on us as a person. When things don't work out for us though it's usually because there's something better around the corner or along the path somewhere. So instead of wallowing in self-pity and getting caught up in being a victim, stand tall and believe in yourself and your worth. Believe that this disappointment is a stepping stone to a wonderful achievement or opportunity and believe that the universe wants even more for you than you want for yourself. When you let go of the need to question your worth and you fully step into that space of acceptance then it won't be long until you start seeing miracles show up in your life.
I hope you've found this information helpful. You are always in control of how you think and what you feel so choose the thoughts and feelings that are going to support you moving forward not destroy you and keep you stuck in the present or the past. And remember... the more you believe the more you achieve!