I'm so envious because I don't have a brother

I'm a female (14F) and I found this subreddit and I feel like I've missed out on a big opportunity. I have a few sisters who are my age, but I've never felt that "gut feeling" of being sexually attracted to them. They're nice to talk to, but it's not the same because I don't have any sexual feelings towards them. I really wish I had an older brother or a twin brother just so I can explore these feelings.