The goal of aggression is, ultimately, to cause injury, physical or otherwise, most likely out of anger. a.
Sadistic

b.
Hostile

c.
Malevolent

d.
Instrumental

It really depends on

1) how you look at things

2) how your life is going

3) how people are treating you

keep in mind we are all going to die at some point

If you sit around and say your life isnt worth living and do nothing to make it better then your life wont be worth it because you were wishing your whole life that you were someone or somewhere else.

If your life is horrible, your parents treat you bad, nothing good is working out, and everything seems dysfunctional. You dont seem like youre living you just seem like youre existing. Then it really doesnt seem like its worth living, and your life probably isnt honestly, but you existing might get someone else through the day, or you might help someone else make their life worth living. That alone CAN make your life worth living if that made any sense at all

Im still trying to find the answer to your question myself and i dont even know why im still alive sometimes

tl;dr: life is only worth living if you look at it a certain way. Instead of dwelling on how youre miserable and nothing helps, maybe try helping someone else. Possibly in return they will help you.