Never tell a girl you're using her or are going to use her in any manner, jokingly or seriously.
The tone of your first line makes you sounds like you're proud of being labeled a player and using girls.
Try to understand this...You can't shrug off a player reputation if you think you are a player. By thinking you are a player and enjoying the label, you will subconsciously and consciously exhibit player behaviors and present yourself as such.
Great that you're attracting ladies and having fun. But, you have to stop using them and stop telling them that you're using them. If you mean you guys are just ****buddies, that's fine. If she's fine with it, there's no problem. But by believing you're using girls, you'll develop a bad mentality. Girls will become sex objects, and the possibility of love gets further and further away.
Of course, you, like most of us, will not fall in love in high school. However, the skills, mindset, etc. that we develop in high school will progress in such a direction unless another force moves us in a new direction. If you're taking or have taken physics, it's Newton's first law of motion.
How to get rid of the reputation? Change the way you think about the girls you fck. Unless you been officially committing to a bunch of differnet girls. Then, you're ****ed for quite a while.
But if you've just been getting physical with lots of girls without any agreement of a relationship. Then, they should know you never promised commitment and exclusivity.
Anyways, good job with the success. But, for your benefit, start changing that mindset.