Maybe every student has thought about that matter at leat once. Some of them found out the answers and kept studying, or some found the answer but stoped studying and took another way. However, quie a few people still don't find their own reason but keep on studying. In this case, serious problems agonize people. Because, they don't know where to go. I think that the problem is what you really want to do. If you cannot find any motivation or any hope, have a time to think about that. To decide how to design your life is the most important thing in your life as soon as possible. After then, choose what you want. It is worth while to spend one or two years to find out your life purpose or something like. But, after deciding, don't regret your decision. If everybody solves his problems easily, nobody would be unhappy. That's why life is tough. And it takes times. Good luck.