There is really no way to speed up the natural process of puberty. With that being said, young men typically notice hair under their arms and in other places before chest hair appears. In fact chest hair usually doesn’t develop until late puberty, sometime between 12-18 years of age, and some young men don’t get chest hair until they are in their 20’s. Some guys get a lot of chest hair and others only have a very little and still other guys don’t get any chest hair at all. If you can, talk to your dad and ask him when he developed chest hair. It is likely that you will develop similarly.