Everyone in this world is different. No 2 persons are alike.
When 2 people come together, there are bound to be loads of
differences, but it is through communication, understanding and
adaption that they become more compatible. Yes, some people really
want to change their partners, like you too, you stated in your
other thread you wanted your gf to improve. But you cant change a
person to another completely.
But changing and adapting is necessary so as to complement each
other better. If one party is to harbour the attitude that "this is
how i am, i am not going to change, take it or leave it", i am
quite sure any relationship this person is going to be in, will be
doom or his or her partner will be one pathetic sod.