Should I bring all my stuff for the entire year?

If you are travelling alone to Boston/Harvard, yes, you should bring everything. However, if there is somewhere you can keep some of your stuff during FIP (with family or friends) that's great, too, especially if you have a huge amount of things. You will be loading and unloading your things on and off of trucks that we use at the end of FIP, so it will be a lot of carrying for you.