Yeah if you're already consuming protein through your diet, you don't need to buy amino acids. I agree with Darryl - you're better off getting some creatine or something.
But the main thing you should worry about is how your diet is. Make sure you find time to go grocery shopping and prepare your meals yourself. If you're eating like shit then the supplements aren't going to do much for you. A supplement is called a supplement because it SUPPLEMENTS the diet.