Answer:
If you lose me you may cause people around you to lose me too.
It rows quickly with four oars but never comes out from under its own roof. What is it?
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
I shoot but never kills
I help engines spin and pants stay up. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?