I don't want to be a "booty call" anymore...

Ever since I first started dating, I've always been treated as a piece of sex when it comes to guys. I've always found this weird because I don't dress or act in a slutty manner (I mean, I'll wear low cut shirts and tight pants from time to time, but not all the time). Of course, I've never given myself to them because they were all jerks. Plus, I want a legitimate relationship with a guy. Is it just me or is it the guys? What can I do to make myself into a girl that can be taken seriously when it comes to relationships?
I don't want to be a "booty call" anymore...
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