How to be loud not shy helpppp?

so im 15; nd im stil tryin to fiure out who i am, but how does one git over shy ive got over some by theaer i just want to be happy moe in life after two deaths of close friends like my friend is not shy at all nd can be loud make many friends and be ahappy i want that im about 5'1 nd weigh 120 so im unconfy with my weight i need help not concler or things just advice