I had that experience too. I told her that I'd have money for college thanks to working two full time McJobs in the summer, and she was unimpressed. She took that as I wouldn't have much to spend on her, and I was surprisingly okay with the rejection. Any girl who thinks short term "how much can he spend on me today" might be fun to look at, but she's not a keeper. I earned my degrees, earned far more money than she could ever have imagined, and I've seen her a few times since. She still looks like an aerobics instructor and now she's interested in me, but I'm no longer on the market - and I'm grateful that, as a teenager with no more than the usual level of common sense, I dodged that mistake and chose not to pursue.
Well in hindsight, she was hot BUT....eventually, I met HOTTER girls, who also found that planning long-term was a great idea. The objective is never to take your eyes off the ball.