Is it strange that I used to record my farts on my phone and listen to them back through earphones on the bus to school the next morning?
Yes that seems odd. Why did you record your farts and then listen to them on the bus the next morning?
This behavior helps me study for my exams.
That behavior seems a bit childish and immature.  People will not want to be around you if they hear this being played while they are on the bus.
Oh please, like they don't fart on the bus. People should stop being 'classy'.
It's important to have manners. By having manners people will find you more desirable to be around.