Think about this: A black hole is black—could it be a star that has collapsed under its own immense weight and gravity, burning so intensely that its fire turns black? What if a black hole is not a portal to another place, but rather a massive, heavy object that bends space and time? And when it eventually evaporates, space and time return to their natural state.
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Let's unpack the parts of your question about black holes.
... could it be a star that has collapsed under its own immense weight and gravity
A black hole is, by definition, a region of spacetime where gravity is so strong that nothing, not even light, can escape. The only way to create a black hole, as far as we know, is by the gravitational collapse of a sufficiently massive star that has exhausted its nuclear fuel.
... burning so intensely that its fire turns black
This part makes no sense to me.
... What if a black hole is not a portal to another place, but rather a massive, heavy object that bends space and time
"A massive, heavy object that bends space and time" is exactly what a black hole is - but this description also applies to any massive object. What distinguishes a black hole is that it bends space and time so much that anything that gets close enough to the black hole (inside its event horizon) cannot escape again.
A portal or wormhole is a hypothetical structure which provides a shortcut between distant points in spacetime. In theory, some black holes may contain a wormhole inside their event horizon - but we have not directly observed this, neither have we seen any evidence of a white hole that would be at the other end of such a wormhole. So, yes, it is entirely possible that black holes do not contain portals/wormholes.
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