I'm also on the 2GB plan with only 1 line, and my bill is only half of yours. Are you perhaps still making device payments?
On the My Verizon site, try using the navigation bar at the top to go to My Verizon > My Billing > View Bill
it should give you a breakdown of the charges on your bill there. I'm going to guess that the plan and line access fee make up about half of that, and a device payment agreement makes up most of the rest, but whatever the charges are, you should be able to identify them there.