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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The pacifist way only works if everybody else is also a pacifist. Otherwise it is just suicide.
Look at the story of Jesus, he did not fight back, and he got nailed to the cross as a result. Perhaps you would like to be a martyr, but its just not my cup of tea.

Ghandi managed to overthrow the mightiest empire in the world and create the worlds largest democracy, all without firing a single shot. For oppression to work requires the use of force on both sides, the oppressor and the oppressed. Once the oppressed stop using violence they break the cycle and the oppressor is defeated.

I accept that the above is somewhat of a simplification, and real world events are often more complicated, but the path of pacifism will defeat even the mightiest army on a long enough time line.