Q.what should the inside of a pumpkin look like when cut in half
The pumpkin was a bright orange on the outside. I cut the pumpkin in half because I want to can it. But the inside is a white orange. It really isn’t string on the inside, looks like there is a lot of pumpkin walls on the inside. Was this pumpkin ripe? If not, do I have to get rid of it because I cut it in half too soon. I want to can it but I don’t want to make my family sick if I use it.

Certified GKH Gardening Expert
It is likely not ripe enough. Most people would prefer NOT to eat unripened pumpkins, but there are those that do, though it is bland and not very tasty. However, it won't hurt you. So if you want to try and salvage any for pies and such, you may be able to.
For help with pumpkin ripening in the future, these articles should help: https://www.gardeningknowhow.com/edible/vegetables/pumpkin/how-to-tell-when-pumpkins-are-ripe.htm
https://www.gardeningknowhow.com/edible/vegetables/pumpkin/getting-green-pumpkins-to-turn-orange-after-the-pumpkin-vine-dies.htm