Hi, Insecurities are nothing but a display of your low self confidence. You don't have confidence on your love and affection. if you would be full in yourself you would never be insecure. its never late. Since you have reached out for help. talk to a professional, take a counseling session. Rediscover your emotions and relabel them. consult me or any psychologist for same. seek help before it ruins your relation. all the best

Hello Friend, Good that you are seeking a help here. Such insecured and negative feelings are reflection of deep anxiety with in your mind. You may be pre occupying your mind with overthinking about something about future which may cause fear and insecurity. You need to mange your thoughts better. Lifestyle, dietary, environmental etc can also influence with such behavior. If you observed such behavior is affecting your relationship and day-to-day life,then better take a professional counselling help to discuss your problem in details. Surely you can overcome this with a help of few lifestyle changes and self therapies. Don't worry. You will be alright soon.