You sound like me last year.
I had ridden English my whole riding career and then I went to a more western stable where I got my horse and things suddenly changed. Basically, don't opt for western because you are nervous or not confident about the english tack/style of riding. It's just a matter of getting used to it!! If you want to learn how to jump, then english is definitely for you! You shouldn't choose something simply for a matter of convenience. You should do research on both styles of riding, watch videos, and find which is more appealing to you. Although you might not be a QH lover like I am, I suggest you search some of the AQHA Youth classes on Youtube, and search the western classes like cutting, barrel racing, etc. and then the more english classes like working hunter, hunter under saddle, search dressage (that's my interest), and see which one you would be more interested in. Keep in mind that while you shouldn't pick for a matter of convenience, you should still have access to a trainer that can help you with that discipline, and you'll need the proper equipment, whether that means buying your own or borrowing from someone who does (I've spent months borrowing other tack, and it's a great way to try something before you commit). I would try both disciplines, take lessons in both, and see which one you enjoy more. Lunging while riding is a great way to practice on your seat in the saddle, but especially since you are new to english, I would do this first with a trainer or someone with ample experience to assure your safety. There are more variables involved and you want to make sure that you aren't in any danger.
Good luck & God bless!
Remember, go with what your heart tells you.