How can I stop being so nervous around people and open up more?

I think I'm like because i used to get bullied by random strangers on the street. Now, I'm afraid to be myself around anyone. I've been called ugly by random people before and I could never forget about it. Any tips?
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Thank you for your kind comments. I've also been called very pretty by random strangers but I always believe the ugly part
How can I stop being so nervous around people and open up more?
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