There’s nothing to be ashamed of in having coeliac disease and it is easier for people to support you if they know you need a gluten-free diet and understand what it entails. The support of those around you will make sticking to your diet much easier.
Telling people is the easy part, getting them to fully understand the condition is somewhat more difficult.
The following information might be helpful:
Coeliac disease - A short summary of coeliac disease and the gluten-free diet.
Having a coeliac to visit - Advice for your friends when they're cooking for you.
There are several groups of people that you should tell: