I'm not sure where to put this but I'm freaking out a little bit. 

I'm a teenager, not comfortable revealing specific age. A few years back, I used to film sports for my school. I would ride the bus to some games and get food with them after.

On the bus (to or from, i forget) I always say by myself. One day this other kid from my grade decided to sit by me too. cool, okay, whatever. suddenly he started texting me and asking if he could finger me. I was shocked. I didn't say anything, i was talking to the teacher a few rows ahead. I didn't acknowledge it.

Suddenly I felt him slide his hand into my pants and start. I didn't do anything, I didn't tell him to stop, I didn't know what to do. I didn't think of it at all afterwards, I just felt gross. He told a few friends about it, and it went around the school.

thinking about it now, it makes me feel so disgusting and I think it's the source of a lot of bad feelings about myself.

would this be sexual assault? or am i just thinking too into it?