It means, IMO, that you are still growing up...That the full awareness of your sexuality has not set it...That you probably are about 100% normal and not to worry...
Many women experience this their whole life and many deny these feelings of lust...You are young...Grow and learn of life and love your boyfriend like there is no tomorrow...Remember one thing...A woman cannot penetrate you the way a man can...That, to me, would just kill me...The pleasure of the male appendage cannot be duplicated....I think you are a fine young woman, but just learning yourself...
Take care,
Caroline