Dawn/Buffy
You're not boring. You're smart and ambitious and quirky and beautiful. It might take you awhile before you learn to like who you are, but we all go through that. But eventually, I promise, you're going to like who you are and when you get there, you're going to think people who didn't see how interesting you are were idiots.
Besides, Steve's being an idiot right now, but he's not always an idiot. He does like you for those reasons. But sometimes people have their own stuff to go through, and the timing doesn't mesh well. He and his friends are doing their own thing, and you're doing yours, and it doesn't mean you're boring or lame for not going along with something that makes you uncomfortable.