Friend and i question?

ok, i feel really bad because my friends and i always joke around on our bikes and say watch out and then swerve around really quick. But yesterday the person (who was on foot) went the same way as me. We ran into each other and no one is hurt. But i just feel bad like it was my fault. I cant stop thinking about this and she keeps saying its ok. I feel like it is my fault. is it? should i not feel really bad.