I didn't go ahead and change the sheets on my bed for six months during my freshman year of college.
That's unsanitary. Why didn't you change your sheets?
I just didn't. My friends kept saying "What? Are you poor or something?"
I suspect you're not alone in not bothering to change your sheets for months, but you know now, I'm sure, that it's unhygienic. They need changed much more frequently than that.
It's cool, I'm done with thinking about it.
That's fine, just know that it's good hygienic practice to replace sheets around once a week. A lot of skin and dirt builds up, and can make you smell. How about trying to replace them once a month, and then more frequently than that?