@Willow this may be a weird one but I was nervous when I started T because some guys I knew were like "you'll get really angry" which scared me. I have always been really uncomfortable feeling or expressing anger.
It turned out I didn't get more angry but when I did experience anger it was more of a physical feeling than it had been before. And it prodded me towards realizing I had to stop minimizing my own feelings and pretending that nothing ever bothered me or made me angry.