I'm sorry, but I'm simply not one of those teachers, parents, or students myself, who believes joining as many extra-curricular activities as possible is a positive thing.
I've always been more of the opinion that you should do one or two things you really love, and put your heart into them. The fact is, at the end of high school, you will not actually keep in touch with 100 friends. By the time you finish college, you are lucky to have any friends from high school with whom you still keep in touch. In my experience, that handful comes from committing time and energy into one or two things, rather than spreading yourself thin and only giving everything (and everyone) the minimum.
As far as college applications go, today, I think colleges and employers aren't really looking for "Mr. Everything." I think they are looking for someone who is committed, shows growth and potential, and shows loyalty. If your reason for joining as many clubs as possible is to meet more people, try sitting at different tables every day in the lunch room. If it is to boost your elegibility for college entrance and scholarships, work on getting straight A's and writing excellent essays. If your grades, test scores, or writing ability is outstanding, in my opinion, you will be just fine.