Journey, I like what you said VERY much. Looking for super-like button.
"but each moment only defined me in a certain context during a particular time."
So, so true. When we think of defining ourselves, it's interesting what characteristics come to the top. Do you define yourself geographically, ethnically, by skin or hair or eye color, by marital status, by educational status? By working status? Religious belief, and active participation thereof? By health and mobility issues? Recreational choices? Choice of domestic pets - are there differences between cat-lovers and dog-lovers?
Our own time, place and circumstances can affect what quality most defines us at any given point.
"I am limiting my ability or capacity to change, evolve or grow to be my best at any particular time of my life."
I really like that, too. Quite often our self-definitions are negative: "I don't have the talent to do such-and-such." To slap that sort of label on ourselves is very limiting.