Question about the Amtrak?

I'm taking the Amtrak for the first time, it's going to be about a 3 hour trip. First of all, how safe is the Amtrak, I'm a 17 year old girl, and I don't wish to be abducted. Secondly, what type of people typically ride the Amtrak, I won't be too bored if I have someone around my age to talk to...