Is it normal that i am mad at my roommate for getting her nose pierced?

Leave her alone, what she does with her own body and life is NONE OF YOUR BUSINESS!

Nope. Mind your own bees, Nancy.

After a breakup it's sometimes nice to change it up. Let her do what she wants. XD

You seem caring
But that can be overbearing

High feelings
Need reeling

Not your body, not your concern
With yourself and others, you may be too stern

Offer your guidance and support, but also leeway
She'll learn and handle life in her own way

After all, who are you to impose so
That your peer feels she must hide her body from your know?

Why are you so invested in your roommate’s nose? You don’t have to like her nose ring but feeling disappointed and angry at her is excessive and honestly you sound like you want to control her.

What she wants to do with her own body is really her decision. Sometimes the best thing you can do is be supportive. I got my nose pierced at 16 and have loved it since there’s nothing wrong with a little stud and it you take it out it heals over fast it’s not this giant statement that will forever be there. And hair yeah sure some like something new it’s not anything bad. If she finds cosmetic things to make her happy she can go do them. Sometimes a boost of confidence is nice especially at a time you need it most. Before you get all mother hen on her maybe realize it’s her decision.

You either like her as more than a friend, or you're very overbearing (or both!).

Whatever the case maybe, you come off as possessive and controlling. You're just her roommate, not her mom/dad. The fact that she tries hiding shit from you that doesn't affect you in any way means you guys have a weird and maybe slightly unhealthy dynamic going on.

Also, it's very, very common for people to change their appearance after a break up. So common.

Why? It's her body, and her decision. I can't see how this should be anything of your concern. Nose piercings have become quite mainstream in the past few years. I really wanted to pierce my right nostril back in my twenties, but I didn't, because I sometimes will get a zit inside my nose.

What kinda nose piercing did she get?

Leave her the fuck alone. It’s her body you have no say in it and no right to make her feel bad for it. Mind your own business and quit being a twat.

What do you mean by "are my feelings valid"? Of course they're valid. Since when do your feelings ever need validation from other people?

I totally understand giving your friend advice and being worried about her. Especially if shes seeking it out or asking for it. And I've been you, getting angry because it's like YOU WOULD BE LIVING AND FEELING BETTER IF YOU LISTENED TO THE ADVICE I GAVE YOU THAT YOU ASKED FOR but alas.
People do what they want.

If she feels like she’s ready for a new stage in life, let her explore!

Its her body and who are you to tell her what to do with it. Let people enjoy things. Its not like you're dating especially if she saw another person. This just sounds like you're trying to be an overprotective, overbearing person

Let people be.

It's her body. If my bro was going throught this, some drinks would suffice on my end. Anything else is on him.

Nose piercings are becoming normal, but it still looks like a blob of puss sitting there.

You have the right to feel whatever you feel, but feelings are sometimes irrational or unreasonable.

The fact that she tried to hide the piercing from you suggests you're a difficult person to live with. It sounds like you have a combination of problems common in young people: absolute certainty that your opinions are actually rules the world should obey, and a limited amount of experience of the world and people which means you're actually pretty damn clueless.

As her roommate, you have the right to express opinions about what she does in your shared space and to get annoyed if she doesn't conform with whatever you agree (although I suspect from what you say that any agreements you two have reached were the result of you bullying her into agreeing with what you wanted). You don't have the right to tell her what she should do with her nose or any other part of her body, and it's unreasonable for you to take the piercing so personally.