My mind is a blank...is this depression?!

I'm in my first year of University. It's a wonder how I even got here. I just seem to lack a level of interest in reading, writing, and talking about things in groups. For example: In seminars everyone has something to say, but I won't even open my mouth because I know what I have to say isn't very academically smart but it could be if I was at least interested in what we were discussing. I don't find anything interesting anymore. It's like I'm faking it if I do try and pretend that I'm interested in something.

I've noticed that essays take me almost a whole month to do, because even after I've read a whole article, my mind is just blank. I know exactly what I read, but how could I possibly put this into words? Is this depression? I've noticed some other things as well...I was a lot different in elementary school, always top of the class, bright and motivated:s

I don't seem to fall into a hands on type of job either. Absolutely nothing in college seems to suit me either. Just don't have that level of interest. Maybe I was meant to work at the grocery store...really not sure at this point.