Ratheesvar (Theesh)’s Answer
I studied Aerospace Engineering (B.Sc and M.Sc) at Georgia Tech (in Atlanta, GA) and I now work as a technology consultant. Aerospace Engineering is a very interesting field, but it is also a very specialized one. Unless you are absolutely sure that you want to work as an aerospace engineer, you are likely much better off starting your college education in Mechanical Engineering. That way, you will be exposed to a much wider body of knowledge, allowing you more flexibility when choosing what to pursue in depth later on, whether that is A.E. or something else entirely. It is fairly common and easy to switch from M.E. to A.E. when moving from college to grad school. Another option is to major in M.E. and pick up a minor in A.E.
Having said that, if you are 100^% sure that you want to work as an aerospace engineer, go ahead and study A.E. However, the job prospects for aerospace engineers aren't nearly as plentiful as for mechanical engineers, since the field is very specialized, as I mentioned before. Also, think about where in the world you would like to work and what restrictions you may face. I am an Indian citizen, and therefore I couldn't work in the aerospace industry in the US (since jobs in the aerospace industry in the US require you to be a permanent resident (Green card holder) or a citizen, for security reasons). Similar restrictions may exist in other parts of the world, so I'd strongly recommend you do some thorough research on job prospects before making any decisions.
In summary, first think carefully about what exactly you want to do in your career. If you're unsure about what that it is right now (which is extremely likely at your age), consider studying M.E. at the undergraduate level and specializing in A.E. later on (if that is still what you want to do.). Also, consider the job prospects in the region of the world you would like to work in before making your choice.
I'd be happy to answer any further questions you may have (e.g. about my experience studying A.E., what colleges to consider in the US, etc.).