The bottom line? Self can't change self, but the person that you are is a power-not-oneself. Yes, you, the person, can change---totally and fully---provided you really want change more than anything else and are prepared to go to any length to get it. The power-not-oneself may takes various forms (eg God, Jesus, Buddha, or the person that you are). It doesn't really matter what you call this power. It simply needs to be 'not-self.' Why? Because self has no power, and is no power. End of story.
This metaphysical and psychological principle is the cornerstone of all psychological and spiritual healing.
There is an eternal motion---the Now---of which each of us is a part, that never stops … not even for a nanosecond. Each of us, at the quantum level, is a frequency of consciousness, and there is something very timeless yet veridical about that. The timeless in one person is the timeless in every other person and thing. It was ‘there’ even before the beginning of time, it was ‘there’ when it scattered the stars into space, and it will be ‘there’ long after you and I have ceased to exist as conscious centres of life’s self-awareness.