Your diet is completely personal to you, and whether you choose to eat meat or prefer to keep your meals vegetarian, nobody should make you feel bad for your lifestyle.
When hanging around with certain people, however, you may feel like you have to pull the wool over their eyes a little in order to 'fit in' with them - especially if their ideologies are particularly strict.
One man was left baffled when his "strict vegetarian" girlfriend pretended to be a vegan around her colleague, pretending not to eat any animal-derived meals as she said she didn't even want to be anywhere near where cheese was served.