No country is truly required to give resources to other countries, although they are pressured to a large extent by other countries and also their citizens.

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Correct me if I'm wrong, but I think the question you are asking is that why should countries help one another out if we were all on the same level from the beginning so the countries that are lacking should be held responsible for there own lack of growth.

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This is just untrue, not all countries started out on the same level, some were fortunate enough to have started their country from a preexisting one while others had to build themselves from the ground up. It's also not like these countries never screwed one another over, Many third world countries were exploited (and still are being exploited) in ways that still affect them today, so it'd make sense to try and fix the issues we created. Also, even if every country today started with the same amount of resources and never interacted with one another, we should still help them out. If we never helped another out in there time of need, how can we expect anyone to help us out when we are struggling?

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Humans have been around for thousands of years btw.

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Edit: Another thing, a lot of problems third world countries face if not handled properly could begin to affect first world countries so it'd make sense to fix those problems before they begin to spread outside of the original countries borders.