Depressed After a lan party, not sure what the cause is?

I dont know that the end of the LAN party was the casue of me feeling depressed,

But ever since a lan i had, which went for 2 fays, ive been feeling depressed. School is going back soon aswell, could this be the cause?

This isnt just feeling bored this is genuinely feeling depressed. I like school, now that im at a new one, but still idk whast casusing it