Never think that way. Don't sell yourself short, I've met you, you're a really cool guy capable of some very deep thinking and some really interesting discussion. You can also be pretty funny. She might even see qualities in you that she likes that you yourself are blind to. Just be yourself and be confident about it. Confidence is sexy, even if you're not feeling it, force it a little. Not saying act like an arrogant dickwad or anything, but just keep reminding yourself that you are a really great guy and you're totally worthwhile, if she fails to see that then her loss and you move onto the next one. If you feel like you're not worth her time, she might pick up on that vibe, even if it is not true. We're horrible at judging ourselves, let her be the one to decide if you are worth her time or not.