I made an account on ACR with all my personal information. Unfortunately I was under 18 when I made the account so I decided to just lie on the portion that asks for your age. Now I am 18 and want to have the ability to withdraw the money I make on this account. What should I do? (I don't mind forfeiting the money I have on the account currently)
Nothing you can do, you violated the sites TOS(terms of service) when you lied about your age, based on that, the money you had won when underage does not exist.
As for your account, if you want to continue playing at ACR try contacting support and explain to them that you made a mistake when signing up because you were young and dumb, they may let you update your account but may not allow you to keep anything you have won while underage or they may just lock the account.