Well.. I think I know what you mean. But first of all I have to say that people shouldn’t think because of a haircut or anything that they do some things.. Maybe this is something your mom have to learn too.. There are many people thinking this way :)
But my answer depends on whether you actually do this “bad” stuff or if you just don’t want people to think you do so..
If you actually do so, I can’t tell you what you should do to avoid this situation.. But being scared of things people may think shouldn’t stop you from getting the style you like :) And even if it’s your mom that will think this way: maybe a talk about prejudices and about gathering a “bad thing” from a hairstyle will help :b
but if you don’t it should not bother you, ‘cause you know it’s not like this and you can tell your mom - if she should think so - the same thing. :)
So.. Good luck anon ! :)
Hope I was able to help a bit :3