I don't know whether you have thought about what the meaning and purpose of life was. I know that different people hold different views towards this question, so, as for me, I think the meaning of life is undertaking the due obligations and the purpose of life is to obtain happiness.
On the one hand, if we know what our responsibility is, we will stick to our every determination of our life, and if we know what our purpose of life is, we will decrease negative emotions from bad things in life.
     On the other hand, with Internet development quickly, more and more teenagers are becoming fickle and half-hearted. So, knowing responsibility and obtaining happiness are essential for them in confusion.
     Taking the above into consideration, I may reasonably conduct the conclusion that I think the meaning of life is undertaking the due obligations and the purpose of life is to obtain happiness.

Q.E.D.