Dealing with snappy responses and not beating yourself up about everything

Hey everyone, I have a question regarding dealing with short responses / always worrying about the quality of your interactions and work. I'm about to start an internship at a top BB and obviously I am keen to impress. Whenever I have calls or exchange emails with my future colleagues I always worry about the 'snappy' nature of some of their responses - even when I'm not asking stupid questions. Is this something that is natural given how busy they are? Is there anything I can do to stop always worrying about this? If it is common place then that would be reassuring.

Thanks a lot.