For one thing, I'm bisexual and am rarely attractive to fat women. I'm not fat myself but feel like I need to lose about 15 pounds in order to be seductive, especially if I want to appeal to white men.
Wait-who are you trying to appeal to, fat women or white men? You can't be everything to everyone, but you can offer a lot to most people.
And I'm by nature introverted, analytical, and possibly boring in certain contexts. I feel this seductive ability is something some women are just naturally good at.
I do think confidence is really key here. Those characteristics could describe me as well, and yet I haven't found it a stumbling block. Think of it this way: introverted=mysterious, analytical=intelligent, possibly boring=potentially frustrating(and what's a common way to relieve frustration?) Do what you can to feel fabulous, don't worry about measuring up to some stereotype, and flaunt all the charms and assets you've got!
BTW, I knew a guy-a very BLUNT kind of guy- who actually told me I could be "boring"(because I was much more thoughtful and measured than what he was used to). Yet it was quite obvious from his actions that he had a raging crush on me! What he was describing, I think, was actually a desire to get a strong, passionate reaction out of me. If you think of yourself as a cool-headed intelligent woman with hidden passions, rather than a socially-awkward nerdy type, others will pick up on that perception of yourself and respond in kind.
Practically speaking, you can express your analytical side with a direct gaze that makes a person feel disarmed, as though you have seen to their very core, and your introverted side with elusive gestures which suggest there's much more to be discovered about you. And of course, you're not going to be everyone's "type", but projecting confidence(without arrogance) will generally inspire more favorable reactions!