No it won't change your hair....
Take it from a hairdresser........ No it will not change your hair, it will not grow back thicker, change color, be any more straight or curly than it already was. The only thing I would advise is not to shave it unless you have the right head shape and facial features to get away with it.... I can tell you my bf has his shaved pretty close to the scalp just not clean shaven and he is the hottest thing on the face of the planet to me...... And most likely any chick that looks at him thinks the same..... It has a certain appeal...... However if he didn't have that look I would definately say "grow some hair babe" LOL It is one of those things it either works for you or it doesn't.
P.S. Luv ya babe...........