I hope you will tell the truth. Your whole life has a chance to be better if you address things truthfully and honestly now. Do you want to be purging when you're 20? When you're 30? Will you be able to concentrate through school? Will you skip going to class because you don't have enough energy to walk across campus? Do you want to be vomiting in front of your husband or wife? With your kids hearing you? Will you be healthy enough to have kids? Will you even be alive?
Set yourself up for success. Address this when you have the opportunity. Give yourself a chance. You're allowed to make mistakes and have set backs. Don't let them derail your recovery completely. Address it, and get to move on.