First off--You are gorgeous and so is your hair. But I know sometimes you just need to change things up a bit.
I am no hair expert but I wouldn't recommend you go very short. I think your hair looks great long. If you want some of the length off maybe no more than 4 inches or so. I think layers are great for you. Perhaps starting in the front about at the jaw and perhaps some choppy layers framing around your face if you like that sort of thing. I would definitely get some layering all over to give it shape, which you have but just different. With some textering in the cut on top you will have great shape but not helmet head.
It looks like your hair is thick with great volume so I can see this working very well for you. You could also bring your part into the middle a bit if you want a bit of a change there so it is slightly off center that way you don't get the "butt crack" look as a stylist I know once called it
Yeh kind of funny, ever since I've not worn a middle part. My daughter whose 22 will not change her middle part.
That's just a though after looking at your photo. Like I said you are so pretty and your hair I think most styles would look great on you. I'm am definitely not a pixie cut fan. Good luck sweetie. Keep us posted on what you decide and a pic would be great.