I'm a creep
What makes you feel like you are a creep?
I hang up with my girlfriend when I'm in the middle of a phone call.
It is not nice to hang up on your girlfriend. Being a creep is not nice. You should think about her feelings more.
I cannot because I am a creep.
You are able to change your ways if you try. Make a conscious effort to be more attentive to your girlfriend. Tell her you want to make a change, so she can hold you accountable.