I feel like such a horrible person for doing all of the horrible things that I have done.
Well now I need to know some of the horrible things that you've done!
I've eaten all of the food in my house when I was hungry; also I've lied about it.
You should not do awful things to people. You should say sorry for eating all that food. Don't lie.
Why? It's not that big of deal.
It will become a deal, if you're already starting to feel guilty then you should try to relieve some of that guilt. Also, what happens if you continue lying and doing worse things? Just clear your conscious so you can move on.