Omg I’m A Terrible Person😔

Today in my gym class we took a break from playing soccer. I was siting across from my friend. (Her & I r kinda just becoming friends). She was wearing a t-shirt & I saw cuts along her lower arm. Without a thought in the world I blurted out “there’s a lot of cuts on your arm, what happened”. SO DUMB😪!! She barely looked at me and said “stuff”. I felt so terrible. I self harm myself (havent in a while💪🏻). I feel so so bad & idk what to do. Apart of me wants to talk w her & tell her my story about how I self harmed. I just feel so bad it’s eating me alive thinking about it. Should I just leave it alone? I don’t want to make her uncomfortable. Please give me advice:/