I'm wondering why I am still alive.
Did you have a recent moment in which your existence was in danger?
No, my life just seems pointless.
It sounds like you've lost your motivation in life, you must regain this. You have to focus on your mental well-being, get some help with this if you need to.
Shush, stop talking to me.
I can be quiet and listen for a while if that is what you want.  Let me, or someone else, know what is bothering you and why you feel meaningless.  Even just saying it out loud may make you feel better.