presuming you are a young male without much experience, there are a lot of difference

let me just give you an example: when you talk to your gf, you might talk a lot about the surface level things like meals that you have, things happened in the office etc however you didn't communicate about the inner thoughts and mindset.

in order to know and understand someone deeply, when difficult situation happens, you can observe and know what the person truly thinks and acts. when you communicate, you communicate about your requirements and thoughts.

relationship is not easy due to the way male and female communicate and think are different