I'm going to say nope, doesn't make you a man. You did the right thing, but I wouldn't go that far. 

This isn't even an embarrassing moment. At that second your mom goes" Ah, my 14 year old son was jut masturbating." and then forgets instantly, because you're 14 and you weren't even caught masturbating, you just had to talk about your masturbating habits. Oh no