Someone who loves to be alone and enjoys spending time in solitude is often referred to as an "introvert." Introverts are individuals who recharge and gain energy by being alone or in small, intimate settings, as opposed to extroverts, who tend to feel energized and fulfilled by social interactions and external stimuli. It's important to note that being an introvert is a natural personality trait and not something negative or unusual. Introverts can have fulfilling and happy lives while enjoying their own company and engaging in solitary activities.