You can find scholarships directly from your college or you can find outside opportunities. For example if you Google STEM scholarships you will see many results. Most scholarships will require an application, so you'll need to carve out some free time to write the essays and gather the required documentation. You can also search for scholarships based on factors other than your major. For example, if you are a first-generation college student, or if you are a student of color or if you have a disability, there are many targeted scholarship opportunities available. Remember to look at the amount awarded before you spend lots of time on an application, as some scholarships are smaller than others. And of course, scholarships are very often grade-dependent, so make sure to keep your GPA as high as possible, and introduce yourself to your professors so that they remember you in case you need to ask for a letter of recommendation. Good luck!