Is this sexual assault?

So when I was 14, my boyfriend (16) at the time had asked if I would touch him in a sexual way. And I had said “I don’t know” but he grabbed my wrist and pulled my hand down to do it. I was able to pull my hand away because he didn’t have that firm of a grip.

This happened at his house and nobody else witnessed it. Can I bring this to my school or would that be a waste of time? I don’t know if they could do anything for me since it never happened at the school.