is that true that star is formed by dust particle millions of year ago?

Not so much "dust" as H and He molecules. Stars are still forming today all around us. Check out a recent astronomy book, grab a telescope, and go have fun.

Stars have "generations" like people do. A first generation star is made up of hydrogen atoms, when there are enough of them gathered together in one place, they heat up. When they heat up high enough, they start a fusion reaction (the sun isn't a ball of "fire", fire is a specific chemical reaction involving oxygen, the sun is a big atomic fusion reaction.) two atoms of hydrogen get together, and fuse into a helium atom, releasing heat. Once enough hydrogen has fused into helium, the nature of the fusion reaction changes and it's the helium that starts fusing, making Lithium if it's fusing with hydrogen, and Berylium if it's fising with more Hydrogen.

These sorts of reactions happen for a LONG time, Eventually, the 'stuff' a star is made of becomes unstable, and the star reacts in one of a number of ways depending on what's involved. Some stars explode, resulting in a Nova or supernova depending on how big the star was. This flings everything the star was made up of out into space. Eventually, this "dust" can meet up with other dust, start to clump up, and then the clumps get together, and the whole thing starts over again.

the sun appears to be made out of high pressure nitogen and carbon i.e. organic in nature organic dust that was pulled into a gravitational cyclone is very possible the time frame is more likely 6.4 billion years by viewing the motional disintegration of motional disturbance viewed by radioscopy

yes, but this begs the question "where did that dust particle come from?"

this is the accepted answer right now but not prowen beyond a dought.

yea

13.7 billion years ago... it started it all