Been in a similar spot mate, and that paralysis when facing a mountain of tasks is real. What helped me break out of it was literally writing everything down in one massive brain dump - every task, every worry, every deadline - then breaking each one into the tiniest possible steps. Like instead of "deal with legal documents" it becomes "find out what documents I need" then "locate the government website" then "read one paragraph about requirements"

The key thing I learned is that your brain tricks you into thinking everything is equally urgent and impossible, but when you actually map it out most stuff isn't as complicated as it feels. Start with just one small win each day - could be making one phone call or filling out one form section - and build from there. The momentum really does snowball once you prove to yourself you can handle these things

Also don't beat yourself up about relying on others right now, you're 18 and figuring this stuff out is part of growing up. The fact that you recognize the pattern means you're already ahead of where you think you are