Most likely this girl is feeling a strong attraction to you. She likes the dumb guys because she can have her fun and easily push them away. But with a man who challenges her physically and mentally/emotionally, she is hit hard.
She is staying away from you because
1) She's only 21 and too intimidated by you
2) She sees herself falling for you but doesn't see the relationship working out long term.
3) She sees herself falling for you but just wants to fuck around and be a kid
Her staying away from you is actually a sign of her intelligence. A "dumber" girl would follow her tingles and let you completely own her. But she does want/isn't ready to really have her world rocked.
She is staying away from you because
1) She's only 21 and too intimidated by you
2) She sees herself falling for you but doesn't see the relationship working out long term.
3) She sees herself falling for you but just wants to fuck around and be a kid
Her staying away from you is actually a sign of her intelligence. A "dumber" girl would follow her tingles and let you completely own her. But she does want/isn't ready to really have her world rocked.