How to deal with ANNOYING sales people?

When i go to this one cosmetic company outlet theres usually like 3 people working & barely anyone in there & they STARE at me the entire time its so uncomfortable while im like looking at stuff theyll like stare and smile & like whisper... im not weird looking or anything im a teenager maybe they think ill steal something & it just at this store.. i wanna punch them in the face so i just leave wouldve bought something but no theyre constantly like oh you wanna try that on? blah blah blah always staring its so rude iits like get a life & leave me alone i already said im fine just looking no need to stare & make me feel uncomfortable they need to **** off