I think everyone here's going to tell you you're fine to dress as you wish. I'm one of them. I'm also going to add that even if someone here says it's not okay, who gives a ****. The only opinion that actually matters is yours. Who cares about what other people think? No one has to be around you or associate with you. In the end, you're the only one that can't leave yourself. So, do what makes you happy. I'm not too much older than you, only a bit over a year I think. To be honest, no one our age cares about labels anymore. Everyone's just trying to keep their head above water. When it comes to self harm, I won't judge you there. I'd be a hypocrite to tell you not to because I've done it very recently myself. Adults do it, too, it's just better hidden as we age. I do hope you're working on your core problem that centers the habit, though.
Best of luck.