Modesty vs confidence

I am really skeptical , will i will be able to articulate correctly what i tend to say. Actually, i don't know that i am using word 'Modest', here correctly or not. But still i want to try this.
Modesty and confidence are two virtues, both of which should exist in parallel, both are highly complementary to each other. but, both actually can easily recede in influence of other.
So, maintaining a balance of both is quiet an art in itself.

Modesty, is essential in learning process. You should always be able to say, that i don't know anything. it's like an old adage in which it is said to always look for half-filled glass. But it easily lead to over-confidence and complacency. So, you should see the half-empty glass, it will always push you to strive more for success.

Confidence, what to say about this, everyone know confidence and belief in your abilities is first most necessity for success in any sphere of life. Confidence is good, confidence in your abilities, confidence of performing something cause you have done it before, or you have practiced for it, or you think you can do it after giving a deep thought to it.
But feeling confident just cause you mother tell you how special you are, or cause you think others can do so can you. Can easily fool you. This the cusp where over-confidence starts taking over you, actually i think it will better calling it unreasonable or fictitious confidence which we develop, cause we want success and we know how important it is to be confident for success.

I don't know what i have written...what i am feeling is like a great philosopher, i feel like i am so great...i feel like an intellectual whenever i write something. Am i bragging about myself or just writing my feelings. it definitely does not sound like modesty nor it is like confidence. So, What is it... is it something else.