How do i tell someone about my eating disorder?

So ive been bulimic for 5 years now and am just realizing how severly serious my problem is. after looking things up online. and looking up support groups..and ive made some ind of mental attempt...but im scared...and no one even knows i have a problem. even my best friend of almost 10 years. i justr need somone i can trust to suport me and help me cause i guess i have too much pride i thought i could fix this on my own and i cant. and each day is gettin more and more difficult. im not afraid of dying. but who im leaving behind. and the secret they will find out when it does happen. and how shockin and shameful it will be. ..and how no one will really know the truth from my mouth...so i have somone who wants to be with me and im really thinkin of telling him..if he wnats to even get involved with me..but he seems to think imperfect and amazing...but i am soo far from it i duno if hes mature enough to handle it...but then again i think he might be since he has been clean for awhile now after his mother sent him to rehab for havign a drug problem. but he is compltely past that and such a different person..i think he might understand and might try and help me...how do i tell him..what do i say. i get anxiety jsut thinking bout telling anyone my shameful secret. thats literally taken over my life for the past 5 years. i cant even be a normal person anymore.