That does sound upsetting, OP. You've got a lot going round in your mind right now, it sounds traumatic and you're trying to make sense of it, right? I felt like you do after I had my son, very violated, no one listened and I had no answers for anything.
I had an episiotomy, it was medio-lateral, the normal way. I also tore off of it (figured it out myself though!) which now looks like an upside 'Y'.
At first glance when I checked, I thought I had been cut twice without consent. I was ready to complain, then thought 'maybe I tore?' I had no idea as they told me nothing about my injuries.
I also found out I had 2 labial lacerations as well which looked (on the diagram in my notes) like the line going down in the diagram you've drawn. So it may be they were spontaneous? I also had stitches on top wall inside and had no idea why! And although it didn't happen to me, I have seen torn labias as well, and know it can happen naturally. Given that it was a forcep delivery...
I'm sorry if this is long-winded, but the doctor saying 'that's how I always do it' is probably because she's referring to where she cut, rather than the whole injury - have you put this to her? That you do not know how the injuries happened, whether they were natural or not?
I'm sorry, I'm trying to make sense of your injury for you in a way as I know how I felt when I first saw the unexplained damage done to me, it was very traumatic to see. On top of that I never knew why I was cut. It's bullshit!
I would continue with the complaint until you get answers. Have you asked for a debrief to help explain your injuries? Then you can decipher from that what happened, it may help.
Please forgive me if this is not helpful. I really hope you get what you need. This is why I think it's important to actually tell women WTF has gone on and why after they have their baby, and not have to play mini detective to find out what happened, to prevent unnecessary emotional trauma!