Hi there, thanks for posting chart with grid aspects. So there are three things in your chart that stand out to me. Firstly, the Mars RX h12 as you point out. Which makes an opposite to Mercury. So there is so much that you want to say to defend yourself, your anger is there but it is hidden. You are afraid to express yourself because of this inverted Mars energy so you act passive instead. But where does that anger go? I would suggest a physical exercise such as jogging, fencing, soccer. Because you are so young, it will take time for you to come into your own and have the self-respect and confidence you need. It's there but you are actually afraid to cause a scene and be noticed because of your Sun/Pluto square. With Pluto in your 4th, there was/is lots of family trauma, esp with the males of your family and this has caused you to retreat into yourself. Could be a sibling or father figure.
Sun/Pluto people can be extremely negative and self-destructive. Perhaps you curled into fetal positions when you were young because of the trauma and you are recreating this
same pattern growing up. I am a Sun/Pluto person too and grew up in a toxic house
with a rage-aholic and never knew when the next punch or slap was going to come from.
I taught myself at a very young age to not be noticed, to not be seen or heard as then
I couldn't be the focus of the physical or verbal abuse.I don't know if you were physically abused but you lived in fear and you learned to keep quiet about it.
You could even join a support group of some kind as your inner tension and anxitities
are not going to disappear without doing some inner work. You will recover and heal
but it's a long journey. Your Sun/Saturn aspect makes you reserved and cautious.
You do not trust life or people very easily. But it's a strong aspect in terms of being
able to overcome your difficulties through maturity and hard work. With that stellim
in 6th house, you need to untangle yourself from the family drama to avoid getting
sick. This stellium also brings out the Virgo qualities of being quiet, reserved and
suffering in silence. But it doesn't have to be that way. The rest of your chart does
indicate that you can lead a more balanced life emotionally and be happy with yourself.
All the best and hope this helps. Also, at some point, Mars will turn direct in your progressed chart. So at that point, you will learn to be more assertive and to stand
your ground!
BB