I have a few recommendations for getting out into your team.
1) If you are able to drive a car and drive people home, reach out to the kids on your team that need a ride sometimes. Some of my best experiences in many of the activities I am involved in occurred before I hit 16 and started driving. It just felt cool to get a ride from the seniors and talk to them one on one. People your age may also not have cars, so getting a ride with a friend is cooler than parents sometimes
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2) Maybe spend some time listneing into people talking and see what they're interested in. You'll find that they're not as imposing as you think. Making fun of yourself if you make a mistake (to a certain degree) shows that you have a good attitude and you take things as they come. People will be more willing to hang around you if they see you have a laidback attitude.
3) I'm not a member of the technical subteam, so my first year I felt really left out becasue I just didn't spend those 7 days a week in the lab. Yah, you can't do much about that.
Good luck.