I used to use it on my phone and in browser on both my PC and my dad's. I stopped using it when my parents found out and had a talk with me about how talking with strangers is bad and that stuff
I was saying that while the internet can be a bad place.... Actually I didn't know what I was saying there. Strangers are everywhere, even if is on the internet
Although I think that my parents forbidding me from using Discord is somewhat hypocritical since they use Facebook, my mother uses Instagram and my father uses Twitter (and if you ask, I don't follow him and he doesn't know that I use Twitter).
I don't know how accurate your age is to who you're actually are, but depending on where you live, the age of being able to use those platforms is 13. However, there are such thing as certain family restrictions and such.
If I were you, I would just stick to what you have, and wait until at least 16 so your parents believe that you have the responsibility to use said platforms.