HELP: Land Rights

[Tyreek King-El]

Good afternoon team, looking to see if anyone knows how I'd go about figuring out if a plot land is part of my property or not. Some info about the reason I am asking: There are a couple identical builds all in vicinity of my home (Picture a two row carton of eggs, each egg is an identical home). My backyard neighbor's yard extends all the way out the street, delineated by his fence, making it an end unit. Mine on the other hand, a mirror image build and plot of land, has a fence that does not extend all the way to the street. Over my fence is just grass, and what WOULD be an end-unit if they decided to build there. But I don't know if i should take my fencing as reasoning that the grass over my fence will be for another home in the future. 

I ask because the grass can grow pretty wild on that side of the fence, and for my own comfort, I get it cut when i get my own grass cut, but do not know if it is mine to tend to. That being said, I would LOVE for the land to belong to me, but don't know who I'd contact to get the fence extended if it does belong to me. 

Any help is appreciated!