How can you get taller if you are 19 and only 5 feet and 54 inches and weigh 149 pounds?

5 feet and 54 inches would make you over nine feet tall, so I'm guessing there's a typo somewhere. First, I wouldn't worry too much. You've just entered the fastest growing phase for young males, and some enter it a little earlier or later than others. However, it could be you won't be as tall as some of your other peers. That's perfectly natural. Only good nutrition will aid your body in getting what it needs to fully develop. There is no magical technique or substance that will make you grow past what you genetic code has programmed. The most important thing you can do is learn to be comfortable with yourself no matter what.