Is fooling around a bad thing when you are young and single?

I have always had the motto that as long as the guy was cute, didn't have any kind of disease, and i was enjoying it whether it be or just plainly fooling around it wasn't bad, because both parties get what they want and need. but lately I've been seeing other girls like that and wonder if it really is a bad thing...I just don't wanna regret no enjoying my youth to the fullest once I get married later on in the future. I mean I drop guys easily, sure, sometimes feeling guilty once in a while but mostly im just going out to have fun, truethfully I cheat and when they ask straight out i tell the trueth. One day im with one guy another day with another guy. Is that a bad thing? I mean im 19 yrs old i just want to have fun.