I shouldn´t take life too seriously, should I?

Fight! Fight! While I was driving home today I realized that human beings have been fighting since they were born. Some fight more than others, of course. The thing is : we fight from the day we were born. Actually, leaving our mothers womb is pretty difficult. The process of coming to this world can be considered our first fight. However, I came to understand that no matter how much effort you put into something, there are no garantees that you are going to succeed. And that, my friends, is really frustrating for me. Believe me. When I was a child, I belived that if I studied something or practiced something very much, I would really be good at it. Consequently, a "reward" would come. For instance, good grades. But why did I study so much? Why did I keep myself so busy? Because I thought that doing it, I would get a good job which means good money. How naive I was! Life is not that simple. And I thought that all those classes would open the doors for me. What´s the point in learning question tag, inversion and all those things if I don´t even use them? What´s the point of eating lunch really fast in order to have Spanish classes when most of your friends are enjoying the pool at college? In the end, we are all in the same situation no matter how many languages you speak, no matter how much you worked. Life is really not fair. I´ve been thinking about it lately. It´s always the same thing. I come to the same conclusion. I look at the past and I think that I shouldn´t have taken life too seriously. But then again how should I have taken it?