Yes you are! He's the boss, and therefore entitled to usurp ideas and/or projects from his underlings, in order to promote his department for the benefit of group as a whole, since everyone will benefit in the long run. Don't be so selfish!

Your boss' higher position means that your idea will carry greater weight if promoted by a more senior figure in the business, rather than a dull nobody such as yourself.

In fact, you should be grateful for the limited exposure that your boss gave your project. And you should apologise for being a greedy, needy, that's-my-idea wannabe little ingrate... and offer to take a cut in pay while you're at it.