Hi... What you are experiencing is a mix of changes related to age and social setting. You might have recently switched from WFH or still continuing, it has impacted the lifestyle of many IT professionals, so that may also be a reason. And most importantly this is a gestational period before moving onto your married life, so your mind may be latently generating some anticipations/fears. Also, I believe there are some work/career related concerns as well. You need to sit with a therapist to reflect back on your deeper self and understand what exactly is troubling you.
Next Steps
Consult a Psychologist.
Interpersonal Guidance and Counselling using Psychoanalytic Approach is required.
Health Tips
Mr. Gunjan Maithil
Senior Psychologist
Cell: nine six seven one three zero three one three four
Website: https://gunjanmaithil.wixsite.com/therapy
App: http://wix.to/fECHB08?ref=cl