Preferred pronouns confusion

I’ve gone by she/her all my life and still do go by she/her pronouns but for some reason they/them pronouns make have a different feeling then I did in the past(it’s hard to explain).

I’ve never been super feminine and been more on the I guess “masculine” side and often got called a tomboy or identified as a tomboy, but have never thought of myself has non binary.So, I feel like I shouldn’t be feeling any type of way or like possibly being referred to as they/them, if I’m non binary.

I’m so confused and really don’t know why I’m feeling like this....