My responses are:
1. As you yourself use the term, how do you define the word 'evil'?
Evil is a lack of caring; it's intentionally doing something knowing it's hurting someone and caring not one whit about it, or even if there is some twinge of remorse, it's covered by inaction. I think real, dark evil in the biblical, supernatural sense of the word does exist too. Finding a concrete definition for this is a little harder tho
2. Are the things you think are "evil" things that are in your control or things that are not in your control?
I think being evil, as mentioned above, requires intention. Evil is vindictive and selfish, so I believe these things are in our control.
3. Are the things you think are "evil" things that you can change or things you cannot change?
Maybe we can change our actions, but I don't believe having an evil thought makes us evil, as we acknowledge its wrongness and take pains to not bring it to the fore--it's when we act on it that's the problem.