Why do older men take advantage of young, quiet shy girls?

I'm an 18 yr old girl, and a lot of men think I'm pretty and cute. I am however very shy and quiet. I am a book worm and a social outcast, with an outlook on life and interests beyond most people my age (not saying I'm extremely nature). I have a childlike nature in some ways, but I am also a very depressive and emotionally sensitive person... I don't believe in happiness. My religious beliefs get me through killing myself. The thing is, there are men who have found out about this, and they perceive my quiet nature as a sign of submission, so they think they can take advantage of me. They compliment me all the time, brag about my intelligence, how special I am, lend me their jackets, give me lots of kisses and cuddles and talk to me affectionately. But some of them act very dominant and condescending towards me, sometimes not really caring about my opinion. I love older men, but I need to be careful. I just want to ask, what is going through these men's heads when they decide to do these things to young shy girls? What is it about us that they find so appealing? I have my theories, just interested in some other opinions.
I have no romantic experience at all.
Why do older men take advantage of young, quiet shy girls?
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