feel free to, and unless you are a Power User (and watching videos while writing papers/checking email is not a power user) there is absolutely no need for 8GB of ram. I will literally go as far to say that probably 90% of 13" laptop users are perfectly ok with 4GB for most multi-tasking (music, web, paper, video etc). Unless if you are playing intensive games (which would be ironic on a 13" MBP) or doing some serious editing/compiling etc with Final Cut or whatever I can't see any need for 8GB except for bragging rights. You must also realize the OP is about to purchase a MBP 13" which would lead me to believe it will be a new one that has the faster ram 1333MHZ and better processor...even further justification for being happy with 4GB of ram, especially for a soon to be college student. If this weren't true, I feel sorry for the plethora of people running around with 2GB of RAM in their MB/MBA
It's like saying there's no need for a dually turbo diesel pick up truck for 90% of pick-up truck owners. There will be some who fiercely disagree but the truth is most people aren't towing Yachts and trailer homes.