I'm Usually quite shy or find it hard to speak my mind unless I'm provoked with anger... How can I be more bold?

For context, I'm a terrible flirt only because I'm both - shy and a little afraid of what I may or may not be doing. But, I want to be able to be more bold and confident... the guy I like does tease me but I want to reciprocate it more boldly as a flirt instead of shying or blushing away... How can I change that? Or what is it that I can do to make him fall for me while I can boldly flirt.

I'm Usually quite shy or find it hard to speak my mind unless I'm provoked with anger... How can I be more bold?
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