Monica, the world has gone through phases since it's existence. There are times of ice ages and fire stages which have repeated that course since the beginning of time and it will continue to happen for the rest of time.
However, those changes take millions of years in between. Therefore, in your lifetime, which is just a fraction of a second in time compared to the course of all time, means you will be safe from any sort of
"the end of the world".
Unless, of course, some man made event causes the death of us all.
At some point, yes, the world will end. Our sun will eventually expand as all stars do (projected time is 50 million years from now). When that happens, life as we know it will cease to exist. Then, at some point (projected 17 billion years in the future), the sun will explode (supernova), and the entire solar system will likely evaporate. That's part of the life cycle of a star.
No man knoweth the day or the hour but son YOUR world will end one day so my advice is to get to changing it NOW!
Yes the world will definitely end one day. There will come a day when the sun has used up all it's hydrogen fuel and will expand enormously. It will swallow Mercury and Venus and will fry everything on Earth to a crisp. Then the sun will collapse and start burning helium as a fuel. This will happen 3 to 5 billion years from now.
I am so young, and I just DONT Know? Will it End? This Year?