Is a rebellious spirit a sign of immaturity or an admirable attribute?

As a high school senior, I feel compelled to speak up and against people for what I believe in (since this is the last year I'll see everyone). Consequently, I come off as sort of a 'female canine.' For instance, for Senior Best nominations, I wrote practically 'no one' for all the categories and some insolent saying such as 'if anyone were the best writer, he or she would have already been published" etc. And at the end, I also wrote a paragraph about how unknown people who actually deserve the titles are probably too modest to gloat, so then comes along some unworthy, more popular person to snatch up the title. Ironically, I was nominated by anonymous teachers to be a semifinalist for our school's Most Worthy Student award (only 20/556 seniors were chosen). But the way that I stand up for my beliefs (though not in the wisest manner) makes me question whether or not my actions will come back to haunt me. So is it better to keep it real and come off as a saucy snob or fake it to try and keep peace even if that means pretending to be 'cool' with everyone when you actually would rather drown them?