Just talk to them - I'm sure they'll be happy to answer your questions. If most of the people there are a lot older than you, it can be difficult to 'fit in' (trust me, I've definitely been there), but if you make an effort to be friendly, most people will be friendly back.
I wasn't in a lab in high school, but I had friends who were, and as you become more familiar with the science and techniques behind the research, the more you'll get to do with regards to "actual research". If this lab doesn't let you do anything even after you've learned what to do, it might be a good idea to find a different lab.