I need help to find Fast Travel, I am past the part where I am now the DragonHold, I walked back down and now I am supposed to walk across the whole world again. I did it a few times, but now it's boring to do so and takes so much time.

Is there fast travel, if so how and where do I find/get it

yes open the map click on the symbol for you desired destination and if you have been there before it will give you the option to fast travel.

You can get a bus to all the major city's from Whiterun

You can fast-travel by opening the map and clicking on a discovered location. The game will ask you if you want to fast-travel to that location.

Go to the map, and click on the town you want to go. As long as you have already visited the city, you should be able to fast travel there.