If you really want your LPN, I say go for it, but consider the long-term options available as well. *If* you're interested and *if* you're able, you should consider just getting the RN right off the bat. Being an LPN is wonderful, and I know many LPN's who love their jobs, but remember that in many places the work you're going to be doing is similar or the same to that of an RN, as far as tasks, patient loads, and responsibility are concerned, but you'll be making a lot less money. You said that the LPN program was just over a year, and then if you go back to get the RN it'll be another year, so have you considered just going directly into the ADN program, which should be two years, and coming out with your RN without having to go through LPN testing, etc.? Just a thought for you to chew on.
Whatever you decide, I think I can safely say that despite how the program is set up (hours and such), ANY nursing program is vastly different from the type of classes you're taking for your BSN now, even if the lectures appear to be set up the same.
I agree that you have more thinking to do.
Consider all your options, and of course, choose the one that is most suitable to you. If you're interested in getting your feet wet, there are more than a few things you can do (including shadowing, working as a tech or CNA, getting another ancillary job in a hospital, as well as all the experience you'll get in clinicals, etc.). Let us know what you decide!