One's real value first lies in to what degree and what sense he set himself

Last but not the least , stick to your dream. It easier said than done. After all, future is not all roses. young is just like blooming flowers, they are so beautiful when blooming, which make people feel happy, but with time passing by, after they withers ,most people think they are ugly. and so it is the same with young, we are enthusiastic when we are young, then we may lose our passion when getting older and older. So we should have enough courage and determination to overcome all the difficulties in struggling on the road.