Whitby, Canada - Tristyn Lee began his fitness and weight loss journey when he became a bodybuilder at just 15-years of age. At 19, he has now become a powerful muscle man, and a force to be reckoned with.

Teen athlete and bodybuilder Tristyn Lee has used his incredible journey to clap back at haters in an incredible way. With more than two million followers on Instagram, his recent posts have given us a glimpse into where he came from.

In a new video, Tristyn shared his moving story, writing that "Working out saved my life." It turns out that this teen bodybuilder was bullied and teased because of his height.

"I was always the shortest," he said in the clip. He had no self-confidence, and said that anxiety and depression overtook his life.

"Then I found bodybuilding," he explained. "It's not about the shirtless mirror selfies. It's about all the times when the dumbbells have your back when no one else does."

Things are quite different today. Tristyn Lee has become a legitimate teen bodybuilder and a fitness inspiration. His muscles have developed, thanks to a strict high-protein and sugar-free diet, and he goes to the gym at least twice a day.

He also has numerous endorsement deals for nutritional powders, supplements and workout clothing, and his YouTube channel boasts 1.4 million subscribers.

He regularly posts videos of his training regime and receives encouragement and praise from internet fans around the world.

"Oh man, you summed it up perfectly, you should be so proud of yourself bro!" one user commented. "You're such an inspiration to so many," wrote another.

"Training is living for me. As simple as that. I love helping other people find that same passion that saved my life," Tristyn wrote in a post.

He also has some words for those who bullied him, and advice for others going through the same.

"F*** what anyone else is saying about you. Who gives a s**t what others are doing around you?" he added. "I won’t take one second for granted or waste another moment trying to get the approval of others. Neither should you."