Public Harassment: “I feel angry and violated”

An 8-10 year old boy on a bike cycled up to me while I was sitting outside a cafe drinking my coffee and reading something on my phone. From behind he reached around and groped me.
He cycled away.
I couldn’t find his parent.
I reported it to security.

I feel angry and violated and like nothing will happen because he’s a child but he’s going to grow up worse.

(I was wearing a turtle neck sweater, jeans and boots, the only thing exposed were my hands and face. And it shouldn’t matter what I was wearing).