How does remorse feel like?

This sub seems more equipped to chat about this. Surely more than Google and ChatGPT since they're extremely vague. I've been down a bit of a rabbit hole lately and I can't seem to understand remorse. This is making me feel slow and I hate missing out on things or being limited so I want to give this a try. I want to get as close as possible to feeling it, even if I may not be able to.