You should be in love with your girlfriend

If you feel a lack of love towards your girlfriend, you have to accept the reality and know that she is not right for you.

You don't need to beat yourself up for not feeling the same level of love for your girlfriend as you imagine you should. Lack of love in a relationship is usually due to lack of connection. You cannot make it happen, it just happens naturally.

You cannot help if you don't feel that passion and love for your girlfriend. They are signals indicating that there is a lack somewhere in the relationship. You cannot fill this lack by trying to change yourself, that does not work.

Come to terms with the reality. Acceptance of things as they are is the best way to move forward and end the confusion.