Youngsters think a lot & will become old very fast. What they should worry & what they should not worry about?

They should worry about studies and not worry about future life and all that. the thing is i am the very opposite1 i ddont worry about my studies. i take it all easy. I always worry about what my future because there are certain things i feel i need in order to be happy and i am worried if i mught have it or not. i know that you will help me change that. i just said this because i always right using my heart for all your and other's questions.