Whey protein is convenient, that’s it. If you hit a plateau, there’s nothing whey protein is going to do for you- it’s nothing special.
Creatine isn’t much better. The advantage to using a powder supplement is that you can take it right when you need it- after you train.
Listen to Patricia. Beef is loaded with protein and creatine, and vitamins and minerals and everything else you need to grow.
Except for D-bol. There’s none of that.
At 16, I’m willing to bet that there are better fish to fry before you worry about what kind of powders to get. Lift heavy and eat according to your goals. I’m assuming they are to gain size; if that’s the case, then eat big. Duh. Don’t worry about little shit like creatine powder.