do we really change or is it just the people around us who change?

I was talking to a old friend of mine and he told me that i am the same sweet person that he use to know in high school. i thought that was strange because i have been told over the years that i have changed. I have been told from some people that i know that i have become more self involved, twisted, angry, spiteful towards some people and just plain devilish and not in a good way. I can honestly say that i have been called these things but i don't really understand why. That's why when he told me that i was still the same it bothered me.I started to think that maybe i was not the one changing maybe it was the people who were around me. I know that we all change but i don't necessarily think it has to be for the worst. I have noticed the changes in my life and i think that they have only made me a better person. I have also noticed the changes in people that i know and i have seen the good and bad. I think that everything that we go through has some kind of purpose. I think that we just have to figure out what it is before it is to late. Is change good? i think it is. I think you should just make sure it is for the better, for your self and not someone else.