To answer one of your questions “Why people always seem to travel.”
I will answer this with an analogy.
A cooking show.
A cooking show you ask?
Yes. It is simple. On a cooking show they demonstrate how to cook something you have never heard of with tools you have never seen nor know where to buy, and use ingredients no sane person has in there kitchen. So simply put you watch the show for something NEW that is NOT a part of your everyday life. 
Then you are forced that if you wish to attempt what they are doing you must travel and explore and find places you have no clue where they are or what they carry in order to prepare yourself for the “final battle.”
So you leave you house and venture out into the world first to get the needed ingredients. You do this by researching or talking to people and getting directions. Once you obtain the ingredients you then set forth to obtain the right cooking utensils (weapons) which ungodly costly and seldom used. After obtaining those you wind up back at your place fighting the “final battle” and in the end it tastes terrible.

Sci-Fi is a cooking show.
Most Sci-Fi are based in “new worlds” since these worlds are unexplored many writers “travel” to open different lands and scenery that is building the world.
Now if you look at some sci-fi books that are based in the real life world and cities (example Shadowrun series) you find that travelling is less needed because the reader already “knows” in a general way and new scenery/world building is less needed.
What is tricky is if you are building a world how to expand the reader’s “knowledge” of the world without travelling as the main source of world building. The trick is having different characters in different lands telling different stories of what is happening to them. Building small “bubbles” of different characters with different story sub-plots and reasoning. Then finally tying all of these small stories into one big story like a tapestry.
Either that or find the nearest horse/dragon/ship and start exploring.

PS: Do not give up on your writing. Your writing will change, mature, take different directions, etc everyday of your life.
Deep down if you have a story to tell then tell it. Who cares about proper plots, character development, etc, etc, etc.
Write what you feel and go with your gut. After you are done THEN refine it a bit but ALWAYS dip your brush!.
A painter who sees paintings in their head but never puts it on canvas isn’t a painter. Just a thinker.