Sounds like bored petty bitches to me.
They could also be insecure- you're 21 and they're ?? I'm actually 35 and women with attitudes like that make me really sad. They are missing out on on the really great things in life. Don't let them get you down- they're pathetic!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226