Hi InhaleExhale, well done (as well) on the new job!!!!
Remember as well that each of your coworkers have had a first day/a first week too. And they may have been anxious, scared, made mistakes too so they should understand and support you, just as you'll do for another new coworker down the line I'm sure.
And the responsibility is just as much on your manager/coworkers to see that you're shown what to do and that your questions are answered as it is on you. But you've got exactly the right approach in asking questions if you're unsure of anything, and that doesn't have to be/shouldn't just be on the first day either.
And you're going to be part of a team, everyone has their strengths and weaknesses, so while you might not be so good at something that's OK, there will be other things that you're naturally good at (and very possibly better at them than someone else!). Just give yourself time to settle in, learn the ropes, feel confident in what you are learning, and be yourself.
Besides you got the job for a reason, they obviously saw potential in you, so maybe do yourself the credit of seeing that in yourself too, it's there!!!
Alison