Although the cause of cold and pale hands can be as simple as being in a cold environment or your body's natural response to maintain its normal temperature.
If you have ongoing problems with cold and pale hands, there could be a number of causes.
The first that comes to my mind is anemia. It can be caused by not having enough iron, B12 or folate in your diet.
I suggest that you see your doctor to check your blood for anemia.
Though you are only 14, you need to look up the condition known as
Raynaud's disease, also known as Raynaud or Raynaud's phenomenon or syndrome.
Normally it appears later in life, but it could be exactly what is causing your condition. Do either of your parents have this condition. Perhaps a grandparent.
Most often it is more pronounced during colder weather or during times of stress.
It is not something that can be cured, but it also isn't something that shortens a life. Usually more of a nuisance which you handle for years and years.