Was it nothing?

A couple years ago when I was 15 my brother (who was 18 at the time) had his friend over and we were all hanging out in his room. Well it got late and my brother fell asleep and it ended up being me and his friend watching the movie animal house. I was getting chilly and he said I could sit with him and share the blanket. Then things moved along and he told me to move closer and I did because I thought it would be kinda cool to cuddle I guess with a guy 3 years older. Well then.. He picked me up and sat me in front of him so my back was to his chest and my bottom was on his.. Ya know.. And then he tried feeling me up my shirt and down my pants and I kept saying no and he said I'll be fine. All in front of my sleeping brother!! Then i made up the excuse that my would be up soon and I should go to bed and he tried to make out with me before I left. I went to my room shaking and crying and have been avoiding seeing him ever since. Am I over reacting?? Was it nothing? Should I still avoid him?