Your "self" isn't immutable. You aren't "a certain type of person". You are an evolving experiment. One that is certainly affected by the observer, and one whose outcome is affected by the inputs. If you want to carry something different in your heart, you can do that. You just have to want it bad enough that you can let go of the person you have been.
If you want to get good at something, you are going to need to first be ok being bad at it. If you can do that, then the next thing to do is figure out how you can put yourself in situation where you can safely make a whole bunch of mistakes in a short time. Get comfortable with being uncomfortable.
You can do it. You just have to do it, and then keep doing it.