My age is 22.I am 5ft 4inch and 48kg. Can I become tall and fat?

No. Joan, if you are 22, the ship has sailed on you being taller. You are probably at your maximum height. Anyone can gain weight, but stay within the ideal for your height. Hope this helps!
Size can change. Usually for men your height is set by the time you are 18 or 19. The growth plates on your bones usually close by then. however you can become fat if you consistently overeat and under exercise.