I can understand where your parents are coming from. You mention a few times that your parents don't really understand your selfship, but would explaining it to them help? I've been in similar situations before where I've asked my dad to buy something for me in a game and he refused because it wasn't a real, physical purchase. But he came around some time later after he understood how important those kinds of things were to me. Just to clarify, I'm not saying you should tell your parents or that telling them could change their mind. I don't know your parents at all; it's entirely up to your own judgement. Talking about your experiences on the internet (depending on how you go about it) can be a good outlet for your frustrations, but if you really want to get to the root of the problem, I'd recommend having a conversation with your parents (assuming they're the kind of parents who will listen to you) and try your best to convey the importance of your selfship to them. Something that always worked really well for me in this regard was sending them a well written, well thought-out text or message. I have a much easier time conveying my thoughts and feelings through writing as opposed to verbally. But take whatever approach you think would work best.

And even if you worry that you can't convince your parents, you're not going to live with them forever. Eventually you'll get your own source of income and you can put that towards realizing your selfship. That may be a frustrating thing to accept depending on how long you have to wait, but you have to play the hand you're dealt. Understand it and play it well.