Should I make up for 6-10 years of possibly invalid prayer and fasts?

Since I was 8, every time I got in the shower I would throw water pressure “down there” until my body shook (I believe this is called a climax or orgasm, and I may have emitted maniy but I can’t remember). I read that maniy is supposed to be yellow, but I have only ever had white or clear discharge, so it may have been madhy. After that, I would take my full shower. I started praying and fasting regularly at age 11, when I got my first period. Now, 18, I just learned that A woman is deemed to have reached puberty when one of four things happens:
1 – When she reaches the age of fifteen.
2 – When her pubic hair grows, which is hair around the private parts.
3 – When she emits maniy (fluid released at climax).
4 – When she starts to menstruate.
Does this mean I was baligh at age 8?
Also, I did not know until recently that this was called masturbation (which is haram) and I did not know that ghusl was mandatory after that. Meaning, I continued to pray and fast in a junub state.
I have now made tawba for all the water I wasted and promised to never to do “that” again. But are all the prayers and fasts I’ve done up to now invalid?
If so, should I make them up for 6yrs or 10yrs?
Is there anything else I need to do or I should know in relation to my dilemma?