Pre-T, my sex drive was a bit of an anomaly--if I started the process of masturbating, I couldn't stop until I hit at least 8-10--and it's just gotten worse after starting T. The multiples are out of the question but the drive has become more of an extreme need than a want. Three times a day minimum, five times a day preferably.
I'm a year and a half in now and it's just now sort of toned down. It was seriously taking up huge chunks of my days.
Anyway, I just popped on to add to the myriad of voices that have said it's normal. You really don't hear of many women with high sex drives, cis or trans. My cisgender fiancée says that she rarely thinks about sex until something mentally triggers it; that seems to be the norm.
As far as not finding the same things arousing, that's normal too. I didn't realize how much my preferences would change but things that used to 'do it' for me before now just seem dull and lackluster.