Until you buy your own gear, and get off student status your gear will probably be changing on a regular basis, you will be on student gear until you get liscensed and i don't know about your DZ, if they have rental gear or not but you will be downsizing until you reach a certain size that will be suited best for your skill level and probably stay there for awhile, I have changed rigs 5 times since I started jumping so I know the feeling of having something different on your back, but as soon as you learn about your gear and trust all the equipment you are using you will lose those anxieties, it will come with time and experience, just as everything else in this sport, the more you jump the more comfortable you will become, so jump on!!