I've had very high T levels (for a female body at least) since my mid-teen years. I discovered I was trans long before this, but it did make me start acting more traditionally masculine and it affected my bodily functions as well. I was pretty happy about it, but when I was trying to train myself to be female again I found that it was very hard to do so. Around the time I came out as trans again, my T levels had dropped to a normal range and my E levels rose, much to my distaste. I've become much more emotional than I used to be, and pretty much the regular signs of normal estrogen levels in women.
But throughout that entire time, I've been solid in my identity as male. So unlike many people (including my family) believe, I don't think natural T levels have an impact on trans identity itself, rather impacting behaviors.