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Listen to badass music
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Wear clothes you look epic in
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Force yourself to "pretend" to be confident
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Eat healthy food and exercise
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Therapy
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Realise that no-one cares about the things that you're self-conscious about, and overthinking is a waste of your life
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Realise that you don't need to be a loud extrovert to make good friends and have a good life.
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Spend more time with like-minded individuals or people who push you out of your comfort zone (depending on what you need)
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Gym, work out, get hench