I've been in recovery from a severe eating disorder for 4 years but I feel like a fraud
What about that makes you feel like a fraud?
Because I still have the problems that led to my eating disorder.
You should be proud you've come this far, don't undermine your progress. You should get counseling for your underlying problem if that would help.
I never should have told people I was in recovery, now they will know what a loser I am. :'(
That's not true, everyone struggles with these kinds of things. The important thing is that we keep moving forward, even if we have a few missteps.