I feel retarded in college. Has anyone ever felt this? (Please help!)?

Get help with your cles. I know it seems like all the premed and engineering students have an easy life, but trust me, they don't. Find the smartest student and ask them how they excel in their cles? Likely, they will tell you that they have a study group, a tutor, visit the professor's office hours every week AND study every day (even on the weekends). You can also succeed in your cles, you just really need to put in the work.