Where can I find a girl my age (I turn 19 in a week) that can handle my size, WITHOUT sleeping around?

Long story short, me and some guys were joking around, and somehow relationships became the topic. Now I'm the inky guy in my friend group who hasn't been in a genuine relationship. They basically said that because if my size (they only know because when in gym they've seen it in showers) that I could have a great time sleeping around and find someone that way. But that doesn't sound very enjoyable to me. I would much rather be in a committed relationship. But hey told me that Im most likeyly not gonna find a girl who will enjoy my size unless me, or the girl has slept around alot. Any advice? Comments and DMs on advice are greatly appreciated 🙏🏿