Can weightlifting and taking supplements under the age 18 be bad for the body

whatsup marc im about 14 years old and i been lifting for 6 years i weigh about 132-134 and i wanted to know if what im doing is bad i play basketball but i also lift and people have told me im to young my muscle with grow as i do and i dont believe that also i wanna be a marine when i hit 18 will lifting cause me any damage to where i cant serve in the military (my brother also served and he weight lifts) i also take supplements like pre workout bcaa and protein am i harming my body