How can I improve my speech?

Hello everyone I come to this site to express myself... Since I was a child I have had a speech problem and therefore I can't speak properly, that caused that over the years I became a shy person and without friends, at school from time to time I was mocked by both students and teachers for not being able to speak well, I am now 20 years old, any advice? I would appreciate it very much By the way I have tried with YouTube videos to improve my speech but they don't work...
How can I improve my speech?
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