Am I a slut

I lost my virginity to a guy I never met before. I snook him into my room at night the first time we met and I had sex with him. I met another guy. He took me on a date and to the movies. It got kinda heated in the theater and we went to his car and I have him a bj. I met another guy. First time we met I slept over his place and things got heated as well... We didn't have sex because I was on my period ? all of these guys never spoke to me again... When I meet a new guy all they want is have sex. If I say no they leave and if I say yes they leave too! Why??!!