Is it true we start to become like the people we surround ourselves with?

We become what we do by habit. The people we surround ourselves with provide an example and a mirror. When we are with 'good' people, we behave well and become 'good'. When we are with people who do not pursue 'good', we can too easily adapt to or accommodate such behaviour. As self-reflective people, we work to not adopt these habits but it remains hard as we are not accepted by these people when we do. We work to surround ourselves with 'good' people. 

However, what about the people who do not pursue or see 'good'? We cannot abandon them. We need to be a mirror and a model for them as well. At this point, we reach self-actualization. It sound easy and clear. In reality, it isn't. But we must try.