I am 17 and signed a contract with my local fire dept..?

I am 17 and signed a contract with my local fire dept. aka letter of resignation stating i would not go on fire department property and would not re-apply. I was given no council legal/parental or otherwise and I signed with only 2 fire department officers and no one else there. The whole thing was not recorded in any fashion by anyone. Is the contract legally binding? And is there any infringement of my rights that would allow me to take legal action?