How to disassociate from myself and empathies for others?

I (m26) am a very selfish and convenient person. I always care about my life, my fun, my time, my schedule and my growth. I get irritated when someone interferes in my schedule or actions. Hence, I do not have any empathy or understanding. I do not feel like doing my responsibilities as a son, partner, friend or brother, as I feel all the tasks as burdensome. I do not feel like putting efforts for them, due to which I am not having good relationship with my partner, parents, friend or sister. I rather prefer to sit in my room alone and work on myself by researching online, or using social media, playing games. I also like going out and working out but alone.

I know this is wrong but still I don't get the feeling from inside and keep thinking that doing something for them will take away time from my life, my schedule which I can put into working on myself or my dreams. It is not that I have achieved a lot for myself and have grown a lot by spending time alone, but still don't get it from inside. I understand that I am about to get married in a few years and also will have to take care of my parents in future. It will be very problematic if I don't change. How do I improve and what should I do?