Hello. Yes, we all can go through an existential crisis at any time in life. Your questions are not illogical. But if it is affecting your day to day functioning due to obsessing over it, I advise you consult a mental health professional to help you. No one can really answer these questions with a cent percent surity, but we can learn to live with these uncertainties.
Next Steps
Consult a mental health professional
Health Tips
Practice mindfulness
Distract yourself with some engaging work