How to hide my loss of appetite from my friends?

Basically I eat a good bfast, but I don't want to eat lunch, but my friends (being my good friends) notice. Some just ask y, some lecture me about it, and the really close ones even make me eat. I tell them it's ok cuz I eat dinner (I don't) but I do eat fruits and drink water and the occasional meal because of my parents. There hardly at home. Lots of people tell me im slim, and that i dont need to lose weight. I know i probably sound anorexic or something, but im not. I'm 5.6 and 118 pounds, and I can eat like a pig when I want to. But I just want to lose a few kg... Plz help x