The question you're asking touches on a philosophical concept known as "personal identity" or "self-identity." It raises questions about how we define and understand our own existence and continuity as individuals over time. While this is a deep and complex topic, I'll do my best to provide a concise answer.
Continuity of Consciousness: One way to ensure that you are who you think you are is by examining the continuity of your consciousness and memories. If you have a continuous stream of memories and experiences that can be traced back to your past, it provides a sense of coherence and identity.
Sense of Self: Reflect on your own subjective experience of being you. This "sense of self" is the feeling of individuality and self-awareness that accompanies your thoughts, emotions, and actions. If you have a consistent and ongoing sense of being a particular person, it reinforces your identity.
Consistency in Personality and Behavior: Your personality traits, beliefs, and behaviors are part of what defines you as an individual. If you display consistent patterns of behavior and thought over time, it reinforces your self-identity.
Social Validation: How others perceive and interact with you can also provide validation of your identity. If those who know you well recognize you as the person you claim to be, it strengthens your self-perception.
Philosophical Considerations: Philosophers have explored various theories about personal identity, including psychological continuity, bodily continuity, and narrative identity. Investigating these concepts can deepen your understanding of the complexity of self-identity.
Medical and Psychological Assessment: In some cases, individuals may experience psychological conditions or dissociative episodes that challenge their sense of self. Seeking professional help from a medical or mental health expert can be beneficial in such situations.
It's important to note that personal identity can be a multifaceted and evolving concept. It may not always be straightforward to ascertain, and individuals can have moments of self-doubt or questioning. It's a topic that has intrigued philosophers, psychologists, and thinkers for centuries, and there is no definitive answer that satisfies everyone. Ultimately, your sense of identity is an integral part of your self-perception and can be shaped by your beliefs, experiences, and understanding of the world around you.