I can't tell if I'm just going to be eternally sad or simply not have hope.

For some reason, I'm observing the world around me and it just seems so boring and pointless. And I know I put an update saying how happy I was for the first time in years a day ago, but even back then and now, I am sad, and it seems like the skies are just getting darker in front of my face. Not sure if that's just me but every time I look at the clouds, it seems dull. Even if it's not grey clouds or whatever it just feels that way. I also feel pointless, hollow, and worthless. All the time. I'm just dull, I can't even explain it. I really want to find what purpose I even serve in my life, and so far I haven't found it yet. I don't know if I have one or not but I want to know, though. 

And I'm currently writing while listening to Mother Nature Is A Terrorist by Greeley Estates at the moment, but aside from that I have school tomorrow and I'm honestly not ready to even go. It'll be just as boring as other days. I don't know what to do, but I have to sleep, otherwise my insomnia will just get worse from here.