I am something, yet I am nothing

I am something, because,

I am a son, brother, and perhaps a cousin, to maybe a couple people in my family.

I'm a driver who could meet you by accident and affect your life inadvertently.

I'm a true friend to 2 people out there somewhere making lives easier or harder.

if I am spotted doing something abnormal, people would notice and take action.

if I die, my family and friends might be a little hurt and sad, perhaps.