Sexual assault

Sophomore year when I was walking down the hall I felt someone grope my butt and vagina and I was really scared to the point where I almost cried and I wanted to run out the school and not come back. I think I know who did it and I’ve seen him touch other girls before playfully in the hall. Was it wrong that it felt good? Bc I know that a lot of times being touched in those areas feels good but it also scared me Bc I didn’t tell him he’s allowed to touch me there. His group of friends also saw it and were encouraging him and my friend even thought it was exciting me touched me there