Annoying kids in class?

So im a freshmen in high school and today in third period, i was sitting next to my girlfriend, and these group of kids sitting behind us were throwing seeds and other crap at students in the class. So i thought “they better not throw that at me”. And when they did throw it at me, i picked up something from teh ground and threw it back. when i did that, one of the kids from the group yelled
“N*GGA!” and threw half the bag of sun flower seeds at me, which got in my hair. So i swallowed my pride and thought it was over and ignored it. Then one of the guys changed his seat to one closer to me [which i didnt notice], and threw something hard at my head and him and his friends laughed. My girlfriend looked at me and said “what the hell?” and i said “nothing,, guys behind us are just annoying”.

the teacher didnt notice and nor do i wanna tell the teacher cause im sure this wont happen again,

but how do i stop feeling like such an embarrased fool for being a victim of this?
especially when it happened in the presence of my girlfriend and her friend.

I sooo regret not getting up and knocking that fool out.

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