One of the biggest myths about weight lifting is that it stunts your growth. No studies have ever been shown that lifting weights stunts or inhibits growth. But, as with any exercise program, if you do too much too soon, physical problems can occur no matter how old the person doing the exercise is.

Is it bad to lift weights at 14?

“Growing children should not lift weights with the goal of lifting as much as they can. It's safer for them to start with lighter weights and do many repetitions of an exercise.” ... Studies have suggested that weight training might harm a child's growth, lead to injuries or not increase muscle strength.

Do weights make you shorter?

The evidence is pretty clear that there's no correlation between lifting weights and being shorter as an adult. Barring some kind of catastrophic injury to one of your long bones during adolescence as a result of heavy lifting, there's just absolutely no reason lifting weights would impact your overall height.