A lot of people change for good. Some people just fall off. Just trying to progress in anything, no matter what you're doing, I feel like any progression you make... some people aren't gonna be around you that were around you.
You have to have the service mentality in the sense that you subjugate your own ego, and you subjugate a large part of your own life to really helping other people, being successful on their behalf.
However, when we shift our awareness or "frequency" from self-consciousness - where fear, impossibility or feelings of separation reside - to cosmic consciousness, which is in total harmony with the universe and where none of those feelings exist, then anything is possible.
Thoughts are magnetic, and thoughts have a frequency. As you think thoughts, they are sent out into the Universe, and they magnetically attract all like things that are on the same frequency. Everything sent out returns to the source - you.
You can change your life, because you have an unlimited ability to think and talk about what you love, and so you have an unlimited ability to bring everything good in life to you.