Worried my sudden style change is unsustainable

My whole life I’ve worn grunge clothing, some articles of clothing are a bit childish like mini skirts or graphic tees. But ever since I started college last year I’ve noticed I leaned into a more mature look. I still wear dark clothing because I love it , but everything else like my graphic tees and mini skirts are difficult to wear now. I don’t know if I’ve become self conscious of myself at school 🤔 or I really am just growing up. What are your thoughts on this? Has this ever happened to you ? And what did you do about it ?