Why is being a vegetarian so hard?

i'm about to give up because its too hard. i have been really hungry lately and vegetarian food doesn't cut it for me. a lot of it is so nasty. i hate it! months ago when i ate meat i was always satisfied and funny. i can't eat anything without reading the dam label because i hear cheese contains rennet. there's the problem. i freaking love cheese and i'm pretty sure organic or "non rennet" cheese doesn't taste the same as "regular" cheese. is kraft cheese vegetarian by the way? the label says ingredient says "enzymes" and that's it.