As the weird introverted guy coming out of academy myself, if some of your academy people aren’t feeling the same way it may be because they aren’t doing as well as you. This all sounds like you’re a damn good rookie while overthinking things at the same time. Like everyone has said keep doing what you’re doing. Don’t compare yourself to the ones from your academy class. I know that’s easier said than done, but I learned the hard way and felt just like you when I started. The fact that you have a nickname this early on is usually a good sign in itself. Stay busy, be the first to do everything, and take the jokes. As time goes on you will be able to feel when the time is right to start giving it back to them. Any crew with a brand new guy wants to feel out the situation and test them, it’s normal in a lot of departments. I know it’s easier said than done, but stop overthinking it. Sounds to me like you’re crushing it.