Do I have to wear a bra?

I saw the high school post and I'm 17 and I have pretty small boobs I can wear 32A or 30B. But I honestly don't like wearing bras and don't feel the need most days. I wear mostly baggy clothing because I already don't like the size of my boobs. 
Anyway, my argument is that I see guys nipples through shirts at school. Why aren't they into question? Mine only show sometimes (when they are hard) but I don't really mind it. And I don't get why boobs and penises are being compared! And if they are being compared then why aren't guys made to wear jock straps? I see guys get boners through their trousers too. If my nipples get "aroused" why do I have to hide it if when their literal penis gets "aroused" I see it. So if guys don't have to 100% hide their nipples or penises in public why do I have to hide my nipples? 
Honestly I am more confused then ever because I don't want to offend anyone or get introuble. Maybe I should just wear them? Idk what do you guys think? 

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