hi!
You wrote a good one!!! i am kind of freaking out over this one.
here are some points that i feel you may want to change or so
I often strike people as shy and quiet, maybe even boring
shy and quiet are ok, how about paraphrase boring to sth like "Sheldon-ish" (the big bang theory man remember?)
I vow to change that before college.
how about engaging your roommate here a bit1? say sth like "you wouldn't be suffering blah blah.."
coming up good as new just as people begin worrying I'm dead.
here you may also engage your roommate a bit, like "i can teach you to do so blah blah... it is great fun ..."
the final concluding sentence could have been better if you ask a question or two, the topics that you have covered and you also want to find out from your roommate