Sometimes life teaches us lessons we never forget. And sometimes, we learn these lessons the hard way. I guess this is the reason why we remember them. In my more than twenty years in this world, I've learned most of the things I know the hard way. Some of the things that really stuck to me are the following:
SOMETIMES YOU NEVER GET WHAT YOU WANT NO MATTER HOW HARD YOU TRY. Though some people say that if you work hard enough you'll get what you want, this isn't always true. Sometimes you do get something out of your hard work but it may not be the thing that you wanted. Always remember that it isn't forbidden to try again.
DISAPPOINTMENT IS JUST A THINKING. Don't let negative thoughts rule your life. If you get obsessed with how life is disappointing, you'll never be able to be successful. Sure, life is a bitch but remember that it can always be tamed. Push the negative thoughts away and move on.
Life is hard and you only live once. Move past your disappointments and start living life.