I would think no, you put your car out on a public forum and promoted it, once you make it public, you acknowledge its up for copying. you enjoyed the publicity you got from it, this is one of the by products.
You cant patent a cars looks.
If Bay saw a picture of the car and decided thats what he wanted, you should be happy you inspired someone. Hopefully he says "man i saw this camaro on ???????? and thats the direction we went with"