I'm afraid I don't have any happy, uplifting stories right now, I'm sorry. I'm dealing with a lot of hard and painful grown up stuff right now, but I am genuinely sorry that you're feeling down too. It's okay to feel down sometimes.
I love
@Seisage 's story though! Now that's someone who wants the best for the fish that wound up in her care, and is planning carefully a new set up that will benefit the fish she currently has in her care, and has worked hard to give him the best care he can possibly have while setting up a better long term solution for him. That's a wonderful story!
I do have happier hobby stories, I'm sure, I'm just in a mental space to find them in my memory and share them right now, but I will when the time is right and I can.
However, I agree wholeheartedly with
@CaptainBarnicles , you'd do well to listen to her.
I haven't read all of your posting history, since I've been AWOL from the forum for a long time. But I think I saw you mention somewhere that you're on the autism spectrum? If you'd rather not discuss it I completely understand, that's personal info, and no one else's business unless you chose to share, so I'm not trying to be invasive or demand to know your personal medical or mental health conditions.
But I did spend some years working with people on the autism spectrum, and have a brother on the spectrum, so have some insight. One key component of autism spectrum is difficulty with what's called "theory of mind". Means that it can be harder for you to put yourself in your parents minds, and understand that their perspective is different from yours. That can make it hard for neurotypicals and people with a nuerodivergence to understand each other, and lead to arguments that can become difficult to resolve.
But, your parents are not trying to prevent you from enjoying your hobby, or laying down rules for no reason. The aquarium hobby can be very expensive, especially once you're running multiple tanks, buying live plants, equipment, expensive shrimp etc, and I'm guessing your parents are paying for all of the current tanks, fish, and any future ones you have planned?
The fact is that they have encouraged you in your hobby. You guys have more than one tank already, right? You've also mentioned other hobbies they've helped you with, that you then lost interest in. Your dad has helped you with every water change with your current tanks. So they have supported you in exploring your hobbies. They have merely set limits, and from what I've seen so far, they're perfectly acceptable limits.
You're currently not doing much with your current tanks except feeding the fish. The hard work and maintenance of those tanks has been left for your parents to do. This is why we were all encouraging you to learn how to, and take over, maintaining your current tanks yourself, before planning more and more new tanks and critters. If you cannot maintain your current tanks, then it's not right to set up new ones, let expect your parents to pay for more new tanks that they will then have to do the real hard work on to maintain.
Autism can make it hard to see it from their point of view. But from an outsiders point of view, they are doing a lot to support your current hobby, and are trying to teach you how to manage your hobby yourself, while you're getting carried away with enjoying the planning part of it, and not yet stepping up to take over maintaining the current tanks.
Being mad and resentful about your parents rules won't get you anywhere. It's pretty normal not to necessarily like their rules, and for teens to argue with their parents! But at the end of the day, it is their house, they can set the rules, and in general, parents set rules for good reasons, even if you cannot see the reasons yourself just yet.
If you wish to be successful in this hobby, and I absolutely believe that you can be - pour your energy and work into the tanks you currently have. You have the hobby right there in those tanks. Getting more tanks and other set ups won't make you a better hobbyist. Learning how to maintain, clean, water change, and stock your current tanks will.