Dear Kenny,  

If you are entering high school and are already thinking pretty seriously about a vocation, you may want to speak with your parents about going to a high school that focuses on the priesthood, such as a high school seminary. These are for boys just in your position, but they are not for everyone, so you would have to visit, see how it is, get advice from the directors of the school, and see what your parents think.  

If this is not an option, then you have to give priority to your vocation. Take part in all the usual activities at school, but take care of your vocation. Go to Mass as often as you can, build up your prayer-life, and I am glad to see you want to get your friends involved in good activities too. You are not going to get everyone the first time, but keep trying. Make sure you organize fun but constructive things you can all do together.