Some times I feel something wiggly under my skin either in my arms or eye.?

What is going on I learned about inhalnts a year ago an how when you feel a tickle under your skin from sniffing inhalants that means nerve cells are dying, yet I don't take inhalants noone in my family does and I can still feel. Also what does it mean when a part inside of your body vibrates or you feel a cold chill down your back. And sometimes my eyes move back and forth really fast. What do all of this mean because I'm healthy or is it a part of puberty like my body is growing while awake.