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You don't build a character around a psychological profile. The primary driver of character is desire. Do you know what this character wants? Do you know why they want that thing enough to overcome...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/30054 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/30054 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You don't build a character around a psychological profile. The primary driver of character is desire. Do you know what this character wants? Do you know why they want that thing enough to overcome their shyness to strive for it? No one comes out of their shell except under the compulsion of desire. Create the occasion of desire and you will have your character and your story.