Or consider yourself too self-aware
If you feel like you overthink life, you generally have experienced success in understanding the "why" behind your own or other's behaviors. In the past, it was likely helpful for your survival and resilience. This can also be called intellectualization and this is one tool all humans can use to process experiences. However, when it becomes the only, heavily relied upon strategey, other tools, such as feeling identification and reflection never fully develop. Leaving someone with a lack of diverse tools to deal with life. You can become stuck, like you are in a deadend, with no idea how to move forward in life. This sense of stuckness can cause increased anxiety, depression, panic; or lack of happiness, joy, and sense of purpose.
Asking "why", can be seen as a placeholder for an emotion that is difficult for you to process. Therapy can help diversify your ability to identify, tolerate, and process an emotion. This can include relating to your thoughts with more boundaries, compassion, authority, or empathy. The journey to relating to your thoughts differently leads to a feeling of freedom