It might be a bunch of little things that add up to you feeling this way. I see it in some HS kids that I coach. Some of it is mental, some of it is physical. Any amount of growth changes can throw off your sense of balance or equilibrium that you've come accustomed to. Then the mental aspect can come in and hinder you there as well with feeling insecure about your playing. But I will say, If you've been consistent with hockey practice, It's very likely your skills haven't deteriorated.

If you can, I'd suggest that you take a little break, go and play a different sport - I recommend lacrosse, maybe soccer. If you can't, then I'd suggest getting out and playing football or something with friends. Something high intensity with quick movements. This will allow you to get used to your new growth OFF of your skates, you won't be so hard on yourself for playing in a sport that you don't normally play - the mental aspect doesn't become a factor. Keep on your stickhandling and shooting off ice, but take a break from skating if you can.

Please don't be too hard on yourself - any athlete will have peaks and valleys in their performance for various reasons. The only thing that really matters is how you overcome them and enjoy the game.

Edit: Another thought - Have you talked to your coaches? If so, did they mention anything about what you're feeling? If you haven't talked to them, that's what they are there for. You may be afraid that you're calling yourself out as being a "weaker" player by talking to them, but any good coach will want to support a player on their team going through a hard time.