Does Climate Change exist? Sure. Is mankind a major factor? Most likely. Will the problem be solved? Who knows. Will the planet and everything on it die within the next two to fifty years? Chances are no... But will the situation become in any way better if you keep stressing yourself out about it?
Lean back. Relax. Try living a good meaningful life in a community where your actions affect those you care about positively.
Do not let people whose livelihood is to induce panic control how you feel.
In my experience, there is a huge overlap between climate change deniers and COVID deniers. It's hard to pin any particular deaths on climate change, but you can find people admitting as they die from COVID that they were wrong. The link is direct and obvious and we still can't fix it.
There are so many current, serious problems where we don't get to hold sincere discussions of solutions because they're drowned out by the outright denial of reality. It's not just the world in 2100; it's the world today.
I'm not sure it really helps you to replace the vague, distant dread of climate change with an immediate horror. But maybe it will push you in the direction of a more direct action with a more direct consequence.
I'll admit that I haven't been very effective, either. Answers like this one are about the best I've come up with, and you can already guess what kinds of replies I'm likely to get to it. But if I can help make your perspective clearer, perhaps I'll have done some good.
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I can give you my personal reason why I am not worried.
Human beings have been extremely resilient and shown extreme innovative nature's when it comes to solve problems.
I do not live in an area near the sea and my house is safe for decades. I also have the means to move with family if needed. That would be devastating, but I will live, and so will my family.
The world is shifting heavily towards renewables, and that gives me hope.
China and India have increased total forest coverage.
Innovation is extremely important so that quick and cheap ways to migrate to renewables emerge. I am optimistic about this one, but the progress is slow.
China has converted deserts into forest, and artificial rain has been made possible.
The thing with global warming is that it is "global". It will require decades and global will to reverse it. But I think it will be possible.