Talk to your own parents first and let them know what is going on. My own 12 year old came to me today and showed me a Facebook post from one of her same-age teammates about being at a sleepover, drinking and telling boys to come over for a good time. She was a little shocked about it's inappropriateness which is why she shared it, but it's different when you are in a team setting and have to listen to things that can't just be ignored because you are stuck in that team setting. After telling your parents, my suggestion would be to try to ignore the ones who are initiating these conversations and see if you can bond with others who feel the same way you do (because I will bet you are not the only one who feels this way).