hi...everyone disappoints themselves a few times in their life. you should use this 1L experience to figure out where your strengths might lie. one of my law profs this semester told us a story about one of her colleagues who did horrible on his exams but spent the rest of his law school doing only classes where you could write papers. so you do need to figure something out academically...but in the meantime:
(this is coming from a fellow 1L, so i'm by no means an expert, but this would I do) network your ass off. try and meet people, friends of friends. if your UG gpa is stellar, maybe sneak it back on your resume so ppl will see your academic talents even if they don't lie in the 3-hr, law school exam area. (and I think a lot of current lawyers, if they're merciful, can empathize with having had a rough time 1L year...)
i say go for OCI - you have nothing to lose...you could go in and wow the pants off of them in the interview. make sure you get a LOT out of this year's job and establish some strong recs for your future prospects.
and don't beat yourself up. i also did crappy 1st semester, and i think the best advice was to give yourself a day, two maybe to feel like crap, eat pints of ice cream (what do guys do in these situations?), and move on. you can only go up from here.
good luck!!! : )