Answer:
It's true that there are many things in this world that are negative and make one want to turn back, away from life. But there are hundreds more reasons why we should live. There is more to life than just being happy. What is meaning? The meaning of life is different for each person, but it all comes down to one aspect: happiness is but one part of meaning. Hard experiences are what encourage us to recall what it was like to be happy, to be thankful for those times and the hard times. So this is the advice I would give teen Hamlet - it can take a while to understand what one wants from the good and bad times in life, which is especially why to be is much more satisfying in the world of the living.
Step-by-step explanation:
Try to put yourself in his shoes to see his outlook. What has caused him to make such a speech? It is depressive, so he must be going through a lot.
Hope this helps! :)