A lot of other folks have answered most of this pretty well. For some people, the introversion is more pronounced than others. For example, I may have to expend 2 spoons of energy to go to a party. My husband, on the other hand, will expend 4-5 spoons' worth for the same shindig. So some of us hold up better than others.
Interestingly, he and I are both far enough on the introversion scale that we sort of cancel each other out when it's just the two of us. We're both perfectly comfortable sitting in silence with each other doing our own thing, and thus can be together without making social demands on each other.
There is such a thing as an ambivert. Some people just settle into the middle of the scale, and are pretty comfortable alone or with people.
A spray bottle of soapy water will kill it without harmful fumes or putting you too close into harm's way.