Smelling another woman's bra

Okay so when I was in my early teens maybe not even then, my mom took in a student from South America. She was a middle aged woman. I remember going into her room (which was my old room) and opening up her dresser drawers and I sniffed her bra. It's been 8-10 years ago and I just remembered that I did that today and now I can't get it out of my head. I really don't think the fact that I did that is normal but I can't get the thought of me actually doing that out of my head. It's like I keep thinking of odd things I did when I was younger and keep asking myself 'Why the hell did I do that?' or 'Am I crazy for having done that?' etc. Someone please help!