How do I stop attracting creeps?

I feel a bit mean calling stalkers creeps but man, if you stalk, you are really creepy - from someone whose be stalked too many times. I'm posting this after my heebie jeebies have calmed down a bit from my most recent creep experience. I'm only 16, go to an all girls school, live in a decent suburb in Sydney, I'm pretty tall and big (176cm, 57kg) and I stand up straight so I don't look like a conventional easy target, BUT, I've been stalked full on by two people, followed on my way home once, and just then my older sister found out that our family friend who is 25 or so wants to do weird shit to me... It's too nasty, you know think 18+
I honestly feel so sick of it all and I don't know what im doing to deserve this. I feel like Im disgusting and I have trust issues and am half delusional now.
I'm not even good looking or so. I don't even interact heavily with the people that end up stalking etc being creeps to me.
What am I doing wrong??