Guy's Behavior

Why do boys at my High School always pinpoint me in the crowed hallways in school and un-provokingly talk about my looks?

I'm an asocial young girl. Boys at my school always talk about me (especially in the hallways) shouting, "Look at that girl right there!!!",
"Is she cute?"
"Is she ugly?"
"You like her?"
"Would you date her?"
"Is she thick? Yeah she's thick but she's ugly though."
"Dang! Why is she always by herself?"
*Their surprised/pleasured facial expressions when they find out I'm thick*
Some even try to get my number. The whole thing is uncalled for to me especially their responses. Why are they doing this? And what should I do?
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Edit: This is based on my Sophomore year of H. S.
Why do boys at my High School always pinpoint me in the crowed hallways in school and un-provokingly talk about my looks?
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