Russian pPost-pPunk. 2

We capitalize the first letter of important words in titles.

We were doing different things, and he played it through the speakers of his laptop(his laptop speakers), but in(at) low volume, so he wouldn't disturb me.

At this time, I was very stressed and worn out for(from) studying so much, because I was having my finals, but, also, I was feeling down because offor personal reasons,. I couldn't even show (up) toacknowledge them.

It was frustrating because all of my effort and time were spent in vain and completely wasted.

I'm sorry to hear this.

I was lying in bed, facing the ceiling, thinking about my life, and when I heard thate music, m. My mood changed for the better.

I felt like the people who sasinging understood what I was going through at that moment, that I wasn't alone and that it was okay to feel sad sometimes.

That's great!

Russian pPost-pPunk. 2 (2)

I'm not sure what "post-punk" means

We were doing different things, and he was playeding it through the speakers of his laptop(his laptop speakers), but in(at)at a low volume, so that he wouldn't disturb me.

What is "it" referring to here? Music?

At this time, I was very stressed and worn out for(from) studying so much, because I was having my finals, but also, I was. I was also feeling down because of personal reasons, so I couldn't even show (up) to them.

This sentence is a bit too long, so I split them into two.

It was frustrating, because all my effort and time were in vain and completely wasted.

Great usage of "in vain and completely wasted" to describe effort and time, sounds very natural!

I was lying in bed, facing the ceiling, thinking about my life, and when I heard that music, my mood changed for the better.

That's when I understood everything.

Your sentence is fine grammatically, but I think meaning-wise you meant that you understood "something" not "everything," so I took it out.

I felt like the people who sangsingers understood what I was going through at that moment, that I wasn't alone, and that it was okay to feel sad sometimes.

The melodies were comfortinged me and accompanied my thoughts.