You cannot become a real werewolf
If you mean fiction, use a curse, bite, ritual, or transformation spell in your story
If you want a costume, wear werewolf makeup, claws, fangs, and torn clothing
If you want a roleplay character, create a werewolf backstory and traits
If you want a themed transformation, use special effects, prosthetics, and sound effects
If you are worried about feeling unusual or out of control, talk to a trusted person or mental health professional