One of the best things about learning about Civil Engineering is realizing the number of different specializations associated with the field. The number of positions are high and varied as you can see from some of the other answers. There are really too many positions to list here.
Since you are in San Antonio, I would recommend that you visit the campus of the University of Texas at San Antonio. Spend a few hours learning about Civil Engineering on the web page and a Saturday visiting the Engineering department on campus. From this you should be able to get a good feel for the projects that civil engineers take on.
In Texas, the future is bright for many of positions in the areas impacting new infrastructure since the population continues to rise in Texas and at higher levels than many other states across the US. This means that for civil engineers, the future is very promising. New future developments in high speed rail transportation, water and sanitation, and renewable power storage, transmission and distribution are key areas that will employ many civil engineers within the next decade.
I encourage you to seriously consider the field of Civil Engineering because the demand for engineers continues to rise and being a civil engineer offers you unique opportunities to contribute to an important part of society. I also recommend you visit the web site for the American Society of Civil Engineers - ASCE.org. There you will see the important impacts that this profession has on the US and the world.