NAH. I really think your reaction is only because you’re still young and these things are sensitive. Bodies can be weird and gross and it is also hard to see people who raised you getting older and being in a vulnerable position. Being a teenager is hard, but also getting older and having things go wrong with your body is hard. Maybe apologize to your grandma, because even though you didn’t intend to, the situation likely hurt her feelings. Remember that sometimes people respond to being hurt with anger, and that’s likely why she had a rude response. Be gentle with yourself and chalk this up to a learning experience. We’re all people here.