Welcome to TuDiabetes, @Savannah11!
I am sorry to read all the difficulty and frustration you are experiencing with your 670G start. I am not using that system so I have no technical suggestions to offer you. There are many others here also transitioning to the 670G. You might try this thread started by @DrBB.
I want you to know that your expectations for your new pump are not unreasonable. You should not feel hungry and you should be able to eat what you need to so you may work out and not gain weight. I’ve always felt that every successful regimen for diabetes is built on knowledge. And perseverance – don’t give up and seek out the help you need until you succeed!
Good luck and feel free to start your own topic, if you wish. We have a lot of experienced members here who would like to help.