How early must one focus on engineering in college?

<p>Well, if it helps, the other fields I am considering are very science/math related. </p>

<p>Nonetheless it is a little disturbing to know exactly how early I have to get into engineering. At most of the schools I am applying to, it is fairly easy to declare a different major in a different school but of course the prerequisite ordeal is still the same.</p>

<p>I do like engineering because it has much more job stability and good income compared to other sciences. However I am not all that attracted to what engineers actually do.</p>