It's a test. You are given obstacles in life and you are being tested to see how long you will last, to see how long you can go on, to see how strong you really are. This makes you mentally stronger. So if you ever think that "there is no meaning" or "why even try" keep in mind that everyone thinks this, and you are not alone. Keep your head up high, and stay positive when you think all is lost, because all is not lost. You could be somwhere in the desert suffering from dehydration or freezing in the snow. Things will get better when you learn to beat these obstacles.