Hey there, I have been in a similar situation, i changed colleges this year and found myself being alone in a college not knowing anyone. I soon found myself in a group of people who all came from the same school and pretty much were a tight knit group, best friends almost. I know it is easier said that done but the best thing is just to get yourself involved in conversation as much as you can. To be honest i was surprised that i managed to fit in pretty quickly with the group of friends from college. So the key in my opinion is to just put yourself out there, don't hold back our they will sense that you don't want to talk to them. I know it is scary the thought of being thrown in the deep end with these people, because that is what is going to happen. Once you go through the early awkward moments, I'm sure after a while once you get to know them they will welcome you to the team. Maybe introduce yourself to them. Maybe when practice is over speak to one of them and then maybe hag out or something. Normally when you are friends with someone then other people in the group are friendly. Thats what happened to me, perhaps i was lucky in that respect. But i think that will be the best thing to do.
On the other note you brought up, just act the the way you normally would around your other friends. All i can say really is just be friendly and welcoming. I know it is going to be weird but I'm sure you can deal with it, it might be hard to break into the group but I'm sure if you stick with it then you will be fine. Just be down to earth with them, be careful though.
Hope i have helped, good luck! pm at any time if you want to, ok :)