What should I do to gain confidence to speak up?

My crush used to tease me because of my lack of confidence to speak up. He says that my voice is too low to be heard and makes fun of me (TT)... But everytime I think of trying, I feel numb... can you guys suggest me some tips to improve my ability to speak up ๐Ÿคงโœจ
What should I do to gain confidence to speak up?
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