I get anxiety with my ipod, why?

like i have these skullcandy smokin buds but i dont know what eartips to use for them, the small or medium, i think the medium has a more secure fit and is more comfortable, but im not that sure. i worry about the sound quality and if it is not good enough for me i am sad and depressed. i also have a pair of cx300-b headphones but i am missing the eartips for it. i put the skullcandy ones on those but it dosent sound the same as the original. what should i do?