There's always nerves that I have to deal with whenever my family travels.
Are you nervous because something bad happened before?
Yes. A person in particular dies of drowning.
It's not your fault for what had happened but I can see how that one incident can traumatize you and make you feel nervous. There is nothing wrong with being nervous, but if you feel like it's overbearing then maybe it is worth seeking help with a professional?
I'm probably over reacting. Also, I can't go to therapy because of the money.
Well as long as you know you're overreacting, there's no reason that you shouldn't feel a little nervous. It means that you care and could be considered a good thing.