It's an odd thing to be attracted to, but not unheard of. Be comfortable about your turn-ons and turn-offs. I always found men with muscular necks to be a huge turn-on. We all have our weird fetishes, not to worry.
Is it normal to get turned on by sweat ? I dont know why but the smell of sweat makes me horny and I'm 13
Its the pheromones found in sweat. You are perfectly normal....you might have a heightened sense of smell though.
Everything about this is normal, Don't be pushy to yourself, It's your personal desire & everyone has their own. They just don't talk about so you wouldn't know, People have all different desires, on & offs that might sound odd but it's not odd, It's a personal preference, All you gotta do is get used to it & be comfortable about your desires.
I have something for men with eyeliner. I don't know why..
That isn't unusual but at 13 you really should let it just do only that.