I'm not judging you by your age, it goes beyond whether people think you are fit to run a business or not just cause you're under 18. I am saying that in the USA and many other countries, the law says that anyone under 18 cannot sign a contract. That includes every single 'I agree to the Terms and Conditions' boxes that you have ever ticked, no one can sue you because you are a minor.

If you loan $1,000,000 from someone and you don't pay them back, that person can't sue you or your parents. You could boast to the police how you conned someone into giving you a $1,000,000 and they couldn't touch you. That is why no adult will make a contract with someone under 18, which would also include using your proposed exchange.