As a fellow tall-foreheaded person, you have my sympathies. I can be a bit self-conscious about it at times as well. If only I'd been born in 1533, I'd be just the pinnacle of feminine beauty. Really, though, it is probably less noticeable if you have bangs (hair hanging down in the front). If you put it up with gel, it will accentuate your tall forehead. Anyway, I don't think this is so terrible a physical feature. I don't think it's anything to worry about, biased though I may be.
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"A flower falls, even though we love it; and a weed grows, even though we do not love it."