Why did testosterone make me so violent?

So I'm transgender and well I'm now 23 and well I started puberty when I was 9 (which yes I realise is extremely early for someone born male) and with these seemed to come an extremely violent temper. Even when I wasn't actually angry I still felt some pent up aggression there, quite often walking with closed fists and really feeling like punching something.

I admit I was quite dangerous and not really a safe person to be around, especially when my temper snapped. One of my friends who knew me back when I still had testosterone running through my veins has referred to me as being psychotic back then.

Anyway, 3 years ago I started on estrogen and androgen blockers and within a month my temper greatly deteriorated. I stopped feeling pent up and aggressive and felt a lot more happy and at ease and in place of violent out bursts, I quite often ended up crying instead.

It's taken 3 years to stabilise my estrogen levels though and every time they have slipped my violent short fused temper has returned but then as my estrogen dosage is upped my temper and aggression retreat again.

I'm just really curious though as to what could have possibly caused testosterone to make me so violent and aggressive as I know most people born biologically male don't have such a violent reaction to the hormone?

I was also reading recently that testosterone isn't the sole cause of aggression and that it in fact plays a minimal role which confuses me even more.