Why do most women get stalked?

I’ve been stalked for the first time yesterday, because some men wouldn’t stop looking at me. I was with my sister in law, and 10 year old niece shopping. This man wouldn’t stop following me. It was creepy. I told my sister in law about it and she said to just don’t pay any attention and if he doesn’t anything, report it.
I hate it. I’m tall and big so what man would try to stalk an 18 year old me? I’m still a teenager.
I told my older brother that and he said, “I hate to say this sis, but you better get used to that because most men are like that and to put it bluntly, you’re female and females have attractive features. You’re going to get stalked once in a while. You gotta be very careful around your surroundings. If he lays a hand on you, report him!” My brother wasn’t making me feel any better. He said, “Who said I was trying to? I wasn’t. I’m telling you because it’s the truth. I’m a man and I know what men thing. We don’t sugarcoat our feelings. Be careful.”