Ego, What is Ego? Options

As a person, I have a big ego. I want to win at all costs. I want this and that. I simply want to have it my way. I want the cake and the icing too. I am spoiled and always want to take more than I give back. Is this an example of an Ego?

My ego boost me to gain riches, health, love and many other conquests.
My ego also make new enemies, destroy and corrupt various aspects of me and my environment consciously and subconsciously.

What is EGO? What does this word means?
How do you define it? How do you keep it your slave instead of it enslaving you?
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This is true about the pacifist time line; my thinking is that a person with an ego that is out of synch is more likely to either take offence at something or be oblivious to the wants and needs of others around them; both sides are likely to lead to trouble at some point, but the person with the balanced sense of self is more likely to see what the real problem is and be able to act neither passively or aggressively, but a way which doesn't make a situation worse in the long term.

Having a punch-up might appear to solve a problem, but underneath the apparent ceasefire there is often a lot other stuff going on and the problem is solved much later usually after a non-aggressive period when both have solved the issues either together or separately. It is not the aggression that settles the problem, the true solution always comes later when both parties come to some place within themselves of having a balanced ego, not feeling inferior so that they feel the other guy has won and so they want revenge of some kind nor feeling superior in that they feel that the aggression won, but appreciating what led to the fight and being more realistic about the situation.

Having said this, very occasionally, a smart turn of equal force is enough to make the other stop and think, but I wouldn't support it as the first choice.