If you want to do it, then do it. Don't take what other people think so serious that it would affect something you are interested in. Some people won't like, some won't care, some may like it. In the end, their preference should not impact what you want to do... :)
Absolutely paint your nails! You could even paint them hot pink if you want! Who cares what people think? If you decide you don't want it anymore it definitely isn't permanent. Even bug spray will take it off (I'm serious). So ya try is out!
You absolutely should, your fingernails, your body, no body has to agree with it or like it. Bewho you are and don't hide it. There is nothing wrong with being gau and if people at school want to bully you over painted fingernails, they need to get a life
If you seriously want to paint your nails and withhold the consequential bullying for it, then go for it. But is it really worth it? I vote for no. Some forms of self-expression are less important than physical well-being. I don't trust the typical extroverts and their ability to withhold physical aggression.