18F idk how to masturbate, is there any benefit to doing so?

I'm a girl and Idk how to masturbate correctly, I haven't had sex and that's why I'm afraid that when I masturbate I could bleed or hurt myself if I do it wrong, I'm just curious sometimes some weeks I feel strange, I feel more sensitive like my breasts feel bigger and even if I rub my nipples a little with my bra but I don't know if starting this would be good or not, of those who have tried it has it helped or benefited them in some aspect of their life or is there really no change?