I am 15 years old and I'm not exactly trying to get a full beard but just some sideburns or something. I don't want to rush it or anything, but is there anything you can do to possibly speedin the hair growth up?Shaving or something?

Shaviung your beard will make it grow faster, but thicker at the same time... so before you do it you should think to yourself how long are you going to actually want this style?

True true, so like does it really make it faster I've heard many things that it does or doesn't. Like I don't have any hair yet. Just white hairs(peach fuss) so it would definitely help by shaving?

Yes it may help, but if you only have "peach fuzz" then I wouldn't mess with it yet...