You write beautifully.
May I suggest a few things.?
I come from a place called Planet Earth
What about
"I come from Planet Earth" or "I come from a place on Planet Earth" ? Since you're emphasizing the bubble, planet earth seems like a contradiction.
My community's bubble encompasses our humble town, Half Moon Bay, where we lead fairly blissful lives unaffected by larger world issues.
Through community service, I've learned to extend my hand to others and break through the "bubbles" boundaries that define the lines between whichI live my daily existence.
Just because "bubble" seems a little overused. :)
it's the least I can do in return for the privileged life I've been given at home.
Growing up in a closely-knit community has ingrained within me an appreciation for my own life as well as a desire to reach out and help others who are less fortunate.
--> This is great! :)
You have a wonderful view of life.
Good Luck! :)