Fighting style change

I find that a good starting spot to look at for sword length is between 30 and 36 inches. I'd say try something like that, and you may like it, or you may like something longer/shorter. With a 23" sword, you may find yourself to be just out of reach a lot, especially if you have been using a longer sword until now. Typically, I'd pick a sword that is about half as tall as I am, maybe a wee bit longer.
Another thing to think of is how you plan on using your weapon. You may have been using the bastard 2 handed to get the extra damage, but with anything shorter, this doesn't lead to fighting well. Using 2 hands on the weapon slows down all your movements and restricts you from getting a full range of motion. In larping(in my own opinion)2 hands on a sword that is controllable with 1 hand is only going to hurt you.
The last thing I would say you should think about what style of fighting you are thinking of. If you decide on a good one handed sword, you may want to use a shield in the other hand, or another sword, or you may just want to keep your other hand free.

Thanks for the help! The only reason i chose a bastard sword was because i wanted the extra damage, but the option to go one handed if need be. Dual wield sounds like a good idea, thanks for the tip!

I find that weapon speed is more important than almost anything, with smaller weapons typically being faster. I am also your height (well, an inch taller) and have no problem hitting larger people with a 1 HE sized weapon.

i wouldnt worry too too much about getting beat up. pick a fighting style that compliments your character and that you are comfortable with. at the end of the day, the object here is not to win but instead to tell a story. choose the weapons that will help you best get into character! also, when sparring in kaladonia, please hit kristen very hard. thanks.

Well Alex, I think he'll be sparring with me while Dani is sparring with Kristen.

Thank you so much for the support! I am really shy since I am new and really want to fight well to make an impression, but you are right, it isn't about just winning.