We can change ourselves by many matters but the most important thing - don't lost yourself. We live near other people all time and they give a influnce to us all time. So i supose is harder to keep your approach than change it.
if it is time to change you will change yourself without any efforts. The time comes naturally for it. And if to change sometihing in yourself is very difficult task, I think it is senseless. Agree with supergirl, that is very important to be yourself.
for example I had a negative opinion about love films... But it was enough to see just one interesting very amazing film about two young people and their love, and I have changed my opinion for ever... Now I spend more time watching these films than reading books