Give yourself a break! It was only your first day! If you keep at it, you can only improve.
I sucked when I first became a CNA. I had coworkers and nursing home residents betting on how long I would last!
I set out to prove them wrong and just kept at it until I hit my stride.
I knew I'd broken through the sucky-ness when a resident flat out told me, "Honey, when you first started, I thought, 'there is no way she'll last two months'... and here you are! I think you're one of best one's here!"
God love that woman! I needed to hear that. I was (still am!) socially awkward, but she really boosted my morale. I needed that boost, but I had to do the work and keep at it and keep at it!
It just takes time and building on everything you learned the day before.
Good luck to you.