Can't stop eating

I've left school and currently on summer break for 11 weeks. I've previously had a battle with severe boredom eating but I thought I got over that and stopped it. I am a size 2 in clothing but that's only because i have a very fast metabolism. I'm worried that I'll put on weight now that I'm not doing as much sport as I did in school. I'm constantly eating to the point that I'm 'starving' after I've eaten a full dinner. Does anyone have any tips to overcome this asap?!