Yea... no. Selling an airgun to someone under 18 is against the law so your not getting an AEG till your 18. When you do get one there is no need to tell your local police since they will never see it. Keep it locked away like a real firearm would. Hell get a trigger lock if you want to along with locks on the case.
Its safe to say your parents are not going to be buying you an AEG, so you dont have to worry about any of this for a few years at the very least.