Who specifically? Don’t rely on the words of many people: choose to listen only to select few people, and ideally experts.
5x5 routines are about quickly building your numbers in a handful of lifts. If that isn’t your goal, it’s a poor choice.
At 16 years old and 118lbs (granted, I don’t know your height), you just need to get into the weight room and do some conditioning as well. Don’t worry about strength or aesthetics: worry about building habits and laying down a foundation.
Here are some write ups on the topic