My name is Preetam Roy, date of birth 10 Oct 1986 and my gf's date of birth 12 September 1993.

There is one problem in this relationship according to the prediction. If you can care more about each other, this relationship is still going to be good.
Seen from your description, you have made up your mind to change yourself for her. It is good to know. You should really work hard to regain her trust. Maybe have a sincere talk with your girl to dispel her doubt. If you succeed, remember to stick to your commitment and treat her better.