You often don't get armpit hair until a while later. I do but I am the exception since I am a year younger than 13 and have it. Hair on your legs? I have for many years but I don't think it is odd since I never really look at my friends legs. Your dick is 8 inches? Sometimes it will vary during puberty, mine does but only by a hals of an inch. 8 inches is not weird and size does not matter.