How can I differentiate horniness from euphoria?

I feel horny when I dress in the opposite sex of the gender assign at birth (male), but it's not only that, I feel happy, free and good about myself, that seems like gender euphoria. I use female clothes at home and some times with friends and do normal things, nothing sexual, and it's great. So, you also get excited when you wear clothes that are different from what is expected to AGAB. One thing I've noticed is that this happens when it's a new, sexy outfit or something I've never worn before, but then I get used to it and it no longer causes excitement.