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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Ego = Values?
We live our life with sets of "conditioned" values mostly from our childhood and environment. When someone born and being feed with silver spoon, they usually has a set of values they follow, ie. they will dine in higher class restaurant, date only a person from certain social class, or certain standards, think and behave differently, etc. Ego?

In the Freudian sense, not quite.
Freud divided the mind into three segments - the id, the ego and the superego.

The id is almost an unconscious version of what you described in your first post. It wants to make itself feel good, even to the detriment of others. Sex, hunger, sleep, that sort of thing.
The ego is the reality principle which tries to satisfy both the id and the superego, but in a socially acceptable way.
The superego is the system of values and morality.

In a more day-to-day sense, the ego is our selfishness.

I don't bother with either of these. Dividing the mind only leads to trouble.
Selfishness is something I try to avoid. It has no bearing on willpower, and I find it socially unacceptable. Selfishness, however, is not willpower - it is, in fact, the lack of willpower. It's easy to want to try and make yourself look and feel better than everyone else. Real willpower comes from being able to do what's right - and generally, that's to make as many people as possible look and feel good, even to one's own detriment.