Answer:
I am commonly abbreviated to H
I am sometimes referred to as chips
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
I am an activity involving pins flying in the air.
I go in hard come out soft. Blow me hard and I’ll make a pop.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?