Is there a non offensive way to have this 'chat'?

[hayjay]

I have a friend that I have known all my life, and i love her, but most of the time she drives me crazy. honestly its like i have a second mother, she tries to do everything for me when im capable of doing things myself.
We went clubbing and a guy hit on me and was dancing with me, and she literally just puts herself between me and him because she 'didnt want him hitting on me'. I wasnt interested, but the point is that Im capable of telling him im not interested, but she goes 'if he comes over again ILL DEAL WITH HIM'. its just little things like that all the time, shes always telling me whats best for me blah blah, and its like im young (18), i want to do stupid things sometimes, i want to have fun but most of all i want to make my own mistakes and decisions.
i just dont know how to politley tell ehr to back off a little bit without hurting her any suggestioons?

 

[Kristenatorgator]

Always start with, " Look, Im not trying to be mean"