Teen Gothic

hello everyone, I'm a young person who isn't working yet because I'm still on my way of getting a degree, but one of my teachers (a subject in my country called basic military training) at school has problems with my long nails and punishes my squad's leader for my long nails. I've never thought about it much, but I was struck with the reality of having to restrict yourself from looks related decisions because your study/workplace doesn't allow it, for example in some workplaces you aren't allowed to have a tattoo, a piercing and so on. how do you deal with that? it's really overwhelming and frustrating to me that the joy of customizing my character is being/going to be taken away from me.