Sorry you're having such a hard time. Is it dad or someone is hassling you to clean your room or it is just pressure you've put on yourself?
One thing that's helped me is to create a task list/schedule that everyone can see. For example, if you write on it "Wednesday - clean room." It'll keep you organized and will train others to keep their comments to themselves about your room until at least Thursday!! The trick is you have to follow your own schedule, which shouldn't be as difficult to follow because you control it as opposed to having to follow one who makes one for you. In the short term and long run, it's win-win.