Sexiness is subjective; everyone's definition of sexiness is different. When compared to societal standards of Victoria Secret models being the epitome of "sexiness", some of my friends are not close, like out of the ball park. They don't have the coveted hour glass figure or the face of an angel. But they are STILL sexy. Their own unique intricacies and individuality is what makes them sexy; ultimately, their own confidence in themselves is the sexiest thing about them.
I'm not sexy or hot. I've struggled with my own personal image since childhood and still struggle today. But I try to come to terms to that by stop comparing myself to what the society deems as the only definition of sexy. I acknowledge my flaws and either work towards a better version myself or embrace what I can't change. It's all about baby steps towards self-love. And eventually, your own confidence in yourself is what will makes you sexy.
Yes, guys are attracted to sexiness. But what they are also equally, if not more, attracted to is confidence.