If I die at 15... Can I request things?

You can write a will and a statement of how you want the funeral to be, etc., but generally, a doent like that isn't legal unless you're over 18, so if you died at 15, your parents could still do what they wanted as far as your burial, etc. Also, even after you're 18, you can only leave instructions as to what you want done with your body and your possessions, and possibly what kind of service or funeral you want - although depending on the state you're in and how your parents feel about those requests, they might go unheeded also. No matter when you died or what you specified in a will, you can't leave orders about who visits whom.