I wanna say something to my supervisor at work but I am not sure about what I am going to say. I want to apologize to hem because I did not answer hem when he tried to shake me hand (shaking hand), so please check it for me:

Dear Supervisor, I just wanna say that I am sorry for misunderstanding you in the first meeting of me with you when you welcomed me and tried to shake me hand but I did not answer you because I puzzled over and confused of what I should do because I did not face like this situation before. I hope you did get me wrong.

Please help me as soon as possible.