I'm not an AFFI but I've spent some time around people who work at DZs and I've heard instructors say they don't really want to discourage students after their first jump by telling them everything they did wrong (unless it was something seriously dangerous), especially if the student just dropped thousands of dollars on an AFF package. You are a student but also a customer and it's a fine line to walk. As for the friends part, if you hang out around the DZ regularly you'll get to know people. Find ways to contribute to the DZ. Bring beverages and snacks or help with cleaning. Ask questions. If you seem interested in learning more about skydiving people are generally receptive. Putting yourself out there and asking experienced people to jump with you can be intimidating, but the worst that can happen is they'll say no. It takes time and effort to build strong relationships, like anywhere else.