Beside teh pshycological insecurities tha need to be ignored, everyone at first has to get used to the enviromente and the work, so you can't pretend to be able to know everything on the first try. You're most definitely smart and capable, and your collegues are nice persons, so I really think you just have to ignore that feeling of just being useless. Which is a no brainer I know, but you never say some things ebough. You have to stop worrying about being a bother, especially because you try hard at what you do, and the opportunity that were given to you are all deserved. Do your best and ignore your silly mind ♥

Taking care of yourself is always good and I'm glad you decide to put a goal to reach that is not too far since you're already on the right range for your height.

Good luck ♥♥♥