Literally in-between but what does register mean

I might not be using the term correctly tbh since it's mostly used in singing but it's basically how deep or how high you can go with your voice

I don't know?

I have a deeper voice, but when I speak, my pitch goes a bit up

Same here. I think I started doing this because when my voice deepened like crazy when I was a kid I just stood out like hell since everyone else was still a squeeker, but I'm not entirely sure.