Most Helpful Guy
Upload a pic of yourself so we can get an idea of your style/looks. Otherwise we can't give an opinion because we know absolutely nothing about you. Perhaps while you're being flirty maybe they see how many people you flirt with and find you slutty. Perhaps you're awkward or maybe you give a vibe that says "hey, let's do it." Again I can't give an answer if I don't know anything about you. We can do private chat if you like, as far as any opinion I previously listed goes they are inconclusive and dont necessarily apply to you.
Most Helpful Girl
Maybe because they heard rumours about you that you sleep around.